Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c11f5835fa8566d…

MALICIOUS

PDF

83.4 KB Created: 2021-03-17 18:53:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 360bc9d337d59819ba485433c8cbe6f0 SHA-1: 07f3b3224f9fdc1a165f32ab79657b7f1e68e0ec SHA-256: 9c11f5835fa8566d77bd27f2e68543d0372c0b9d3bae92fa6c590d6c7515f145
186 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=how+to+day+trade+for+a+living+youtube PDF link annotation
    • http://bedesatef.22web.org/mepirujasagulula.pdfIn PDF document text
    • http://busimaderule.mywebcommunity.org/lizumoxigufa.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/temolodeteraf.pdfIn PDF document text
    • http://vifijes.22web.org/9648878095.pdfIn PDF document text
    • https://netexebi.weebly.com/uploads/1/3/0/8/130815192/c9d10ee4.pdfIn PDF document text
    • https://gaxasexafarud.weebly.com/uploads/1/3/4/5/134590452/4718159.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/xevuj.pdfIn PDF document text
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/zizufugofiwo-nubeliwi.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://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_96f26a37d2cf4478a6ce712224f76b34.pdf?index=trueIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_bbc893e4987e416d9ea2e0b547f5ad75.pdf?index=trueIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_65c049aba9c34f52933d76c5631944b0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f5bfe02-706e-49eb-ae9f-5f299d58d49a/whats_fords_slogan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c893c98-d434-426f-90f7-98c52e7aa134/starbucks_reusable_cold_cups_2019.pdfIn PDF document text
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_a84ee46683904c819ada376c6f019e1a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ecd066e-9b5d-47c1-975a-8ab0a9ae462f/tapagiviwipube.pdfIn PDF document text
    • http://mimelaketikapex.rf.gd/are_coloring_books_good_for_adults.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_d75d142e2a254e47b33916a14686779e.pdf?index=trueIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_e419b496c8724b298f28d436f027559e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ebc80ca-21d5-456c-b859-d7eebbff969c/power_book_2_season_1_episode_10_release_date.pdfIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_42526fc124c8461a9e2d317393cd96be.pdf?index=trueIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_6dd012eea7c64fdcbd2caeb5d172512d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7176c599-12bf-4520-a757-54061f37b22d/risozodurim.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_off0000f94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 5132 bytes
SHA-256: 6bf083fe1d5f694a9962bd3f31942343b378ef66e94d875db595889263dc5bef
font_01_sfnt_off00010aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 11268 bytes
SHA-256: 8ed8b8d8ac147da8fa40033b0ff28bd612959640f99fec6867382101d0253f05
font_02_sfnt_off0001317a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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