Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fc75efa7c27acd…

MALICIOUS

PDF

79.6 KB Created: 2021-03-22 14:13:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 18e356b12c1ee6b1bf9bd692859c2d70 SHA-1: a9b51fbaf2873b50644149d7b9c71bfd73ae7108 SHA-256: c7fc75efa7c27acd743e00ef7960e49457cbb5925354a15823463b20d4e13d81
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/award?keyword=steps+of+sand+casting+process+pdf PDF link annotation
    • http://jexekiraj.sportsontheweb.net/59677507550.pdfIn PDF document text
    • http://dugarudewemudo.sportsontheweb.net/26910188419.pdfIn PDF document text
    • http://natosabi.mygamesonline.org/cambridge_english_empower_a1_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_9a60bf0e727340b38e14016848cfe681.pdf?index=trueIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_955fa6432a424ccea9e0fa4b5c9ac40d.pdf?index=trueIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_cca293f9b6a64c77a20069eae065d318.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_d7e4440fbc5b4e938203ea8dfd12ab32.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af1159d9-ec72-4bd5-bb81-9961567c5de5/66235888617.pdfIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_1f9f65647fbf42d28ee53ea0cb7ece52.pdf?index=trueIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_84fca78b4fed4814b3a4f31642321970.pdf?index=trueIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_3e994cc5c0c343a19eedc8c1850c53f5.pdf?index=trueIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_9efb7a33f8d349fda319c28084023c11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b9b791-a562-4ecf-813d-341957ff851f/zofili.pdfIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_fc9001cbad29463f95ecdbc9fff74d97.pdf?index=trueIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_445943bd416b4fa5840b209dc3e97a71.pdf?index=trueIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_0401d1623620403da977a793c5dba524.pdf?index=trueIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_0ccddf96c83f4c3a93545fe1577096e2.pdf?index=trueIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_6d0d62765d35487d908406f5ff1259ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd203e1-4b81-4b41-bd3e-583c40ee87bb/puwajadakuko.pdfIn PDF document text
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_239e12842e62496cb9f6bdd13b3f264c.pdf?index=trueIn PDF document text
    • http://rosevasejila.myartsonline.com/cracking_the_sat_physics_subject_test_15th_edition.pdfIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_8e770c3cabdb4891b89a849fe9046e76.pdf?index=trueIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_a89fff466c6044e09e21d6f66978ddfa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/740cab79-de2f-4f12-b6c3-c8c1a85f723f/what_is_the_income_limit_for_a_family_of_4_for_medicaid_in_michigan.pdfIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_36a9782226694f17b3e4d86f99a02388.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54fb56c6-f45d-4c54-996c-b4c3bb9b3caf/letasoft_sound_booster_1.11_activation_key.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCD 5184 bytes
SHA-256: f43e5a3be5824f640d026c04e5d1ddbb56bf2e3b4f0d32903becf6e85447a866
font_01_sfnt_off0000fe70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE70 10636 bytes
SHA-256: ea19e17a2cc95c278cbcb57930885929b2a7ceb6ef27573b341f45b5caf66788
font_02_sfnt_off00012294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12294 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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