Malicious PDF — malware analysis report

Static analysis result for SHA-256 879a9a9aec491ac3…

MALICIOUS

PDF

75.8 KB Created: 2021-03-09 23:24:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b24b1c6e77ec12f0552cec0a8d04f4fd SHA-1: 72a6ed239ad2cbae58142d0c95d78807b7eca84a SHA-256: 879a9a9aec491ac3acca0e92e53c54133b453a6e66db78d2cb0da52f3e5489ad
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/123?utm_term=honeymoon+in+bali+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462350/normal_5fe7549776751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416514/normal_6040291a17b2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421199/normal_5fe73af0b89eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_6025ee69d2896.pdfIn PDF document text
    • http://zaxofebejip.66ghz.com/55464995148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414486/normal_601e42f8875e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_602bfe80b0556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487399/normal_601db7bdb3d9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368997/normal_5ff07ba466671.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_48b5dd5d02ac48058fb390a8810a9714.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b40ba90f-ee71-4e58-b6d3-a7be305d1192/8334325392.pdfIn PDF document text
    • http://wutaletuf.rf.gd/what_are_the_6_elements_of_drama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94eb9b18-2ae5-49b3-a574-72064abca3da/digital_communications_manager_jobs_london.pdfIn PDF document text
    • http://besikinugid.epizy.com/22363358223.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_273886a542cf463e89066d5c9ff27d4d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd990c45-37a5-46a3-b755-f5946fa0050e/nakepovugopafedipefutatit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4417a89c-40e7-40fa-a74c-a4c5fb5d764f/an_example_of_competition_in_an_ecosystem.pdfIn PDF document text
    • http://bonitadobizaw.epizy.com/electron_configuration_worksheet_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7aff1c9-f83b-42ec-adc9-696763bb2431/g_shock_rangeman_gpr_b1000_price_in_japan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fefe9d3-4a02-43bf-a07e-06cc5fd9d698/95244551067.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_abc4de0ee1604a358f3b3a5a8fb2cd15.pdf?index=trueIn PDF document text
    • http://nalujisutu.epizy.com/mcgraw_hill_my_math_grade_5_answer_key_volume_2.pdfIn PDF document text
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_01e171c42aef4319a6bdbca2fa0d6a0d.pdf?index=trueIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_fded41a86f504f5b9ab3b55dab431714.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB5 5072 bytes
SHA-256: 7ea1414e469d379f3a67b1e913c41bd24e12104e54e9cbf5cb5978a26cb73583
font_01_sfnt_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 10212 bytes
SHA-256: 5c73fdc9911c0cc6a3b8d02dd9b6244b44d7c7ba038f933a5a51f193973a87f9