Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9122a0f58894582…

MALICIOUS

PDF

122.2 KB Created: 2021-03-08 23:24:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b1d55a079bfb8d009ce33cd117a87fcd SHA-1: f73ee4b7c7698bd4fc9b1ce29d523f6f8a7c34b9 SHA-256: a9122a0f5889458284af95fbea750537dd63e88674c53fe594f0dbd9866a3f0e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly flagged it as malicious. The presence of a 'download button' heuristic further suggests a malicious workflow, likely involving the distribution of further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/award?keyword=cours+physique+bac+international+maroc+pdf PDF link annotation
    • http://tafugegajotu.mygamesonline.org/firex_hardwired_smoke_detector_installation.pdfIn PDF document text
    • http://nagesebaz.iblogger.org/97317488306.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/27204595545.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvotawelotito.epizy.com/bigoga.pdfIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_fba62d61685b48a4baf9ec2c54946f5f.pdf?index=trueIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_ebc9066e59d54c14b355b3ca4e1f6b02.pdf?index=trueIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_460b45670ddf44c5b5e6345dbebc7abd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61845f8c-0f0d-4168-ba33-3bf5f1b4b5d1/what_are_the_four_steps_involved_in_the_training_process.pdfIn PDF document text
    • http://dipulitexaxuz.epizy.com/jatitulirogivulakozaz.pdfIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_7f2bfdf3783447b1b55a51cbf426a084.pdf?index=trueIn PDF document text
    • http://sunivope.rf.gd/zezekekibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b50b3d4b-db53-4a38-9948-76d308a7073f/how_much_is_thinkorswim_platform.pdfIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_4b190c22fcb848fcbc5eedb606bb8d03.pdf?index=trueIn PDF document text
    • http://wuvopopimuwes.rf.gd/ridgid_12_gallon_shop_vac_manual.pdfIn PDF document text
    • http://lofekelatek.epizy.com/2123473144.pdfIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_30596d0da7c44a10aad1673d5cb8d946.pdf?index=trueIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_a1a25d766dd44e4fb0ff459358bd5e8b.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_fcca2c7ec496479d9e017b9a241b5f74.pdf?index=trueIn PDF document text
    • http://xuvawesap.epizy.com/pretty_little_liars_series_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf455015-32b8-438a-b349-6e73f0ed766e/tokimeromofovuzidixukeg.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/entry_level_graphic_designer_salary_nyc.pdfIn PDF document text
    • http://bukavomagotixe.rf.gd/aoe_1_hack_map.pdfIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_6471ba9229024174bdadc97015dbbc65.pdf?index=trueIn PDF document text
    • http://dajidagetulawu.epizy.com/axminster_hobby_series_hbs200n_bandsaw_manual.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/jodizav.pdfIn PDF document text
    • http://kilarosine.atwebpages.com/what_are_some_good_workouts_for_basketball.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4279a2a4-355a-4b36-8156-abce1d562032/personajes_principales_y_secundarios_del_cuento_la_mascara_de_la_muerte_roja.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001a78a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A78A 28680 bytes
SHA-256: 0341d400ca564b2baa5a4dc2415db8ae43e715a949850ffe371b82097c210723
font_00_sfnt_off000170aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170AA 5668 bytes
SHA-256: fc0ce38eee84bfaf647d26632d98985a5fb14ee3e7ca924b01fd77cd4f7d951b
font_01_sfnt_off000183cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183CB 10428 bytes
SHA-256: 8adb738a8ea58ac6d9ad8e95324348a888b68b714a4b6658cd06f484a9df0a01