Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd76bf516d454529…

MALICIOUS

PDF

76.1 KB Created: 2021-06-06 03:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1bc14b772036d8879a8ea75cb1def7ee SHA-1: 1b0a2b907d4465c6a6521e85a080dc9780991358 SHA-256: bd76bf516d45452943e29892acf2aed77dd33f5b2d37982238b1ced0ac95c945
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9998

Heuristics 5

  • 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://krisoc.ru/pbw?utm_term=how+to+install+safety+1st+car+seat+without+base PDF link annotation
    • https://doxezasofe.weebly.com/uploads/1/3/6/0/136088479/486718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422906/normal_6036d5e684bae.pdfIn PDF document text
    • https://tubemugipowiw.weebly.com/uploads/1/3/4/3/134345788/9a369f3004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409107/normal_6037cedbaef99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_60642f9800dcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407062/normal_5fe79715319f6.pdfIn PDF document text
    • https://paparudedolenod.weebly.com/uploads/1/3/4/6/134686514/4776417.pdfIn PDF document text
    • https://nebujabes.weebly.com/uploads/1/3/7/5/137515718/e4a69522cc646db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_6018db1e44d19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481819/normal_605674d5cdae5.pdfIn PDF document text
    • https://pukelubaluwo.weebly.com/uploads/1/3/4/7/134741361/xuximoruw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421959/normal_60538d7fdb4a0.pdfIn PDF document text
    • https://ronunute.weebly.com/uploads/1/3/1/0/131070227/tisisupanowemek-xizijozefap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_60b93045e2b54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476127/normal_603e9232e16b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416919/normal_5ffccf3ad403a.pdfIn PDF document text
    • https://dofuzubakav.weebly.com/uploads/1/3/1/6/131606612/38cee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/381aac75-bd47-4094-abb4-a1e11729c8a0/how_to_write_a_resignation_letter_education.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5298f44-d7fc-4344-8ef1-b96c74d840e2/the_secret_movie_2018_rotten_tomatoes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9677a81-4329-4c2a-bb12-62ff3bdfe2d9/can_a_chainsaw_chain_be_sharpened.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 5316 bytes
SHA-256: 5e91475cc964353442633ee493510efbda586b8a7d7797dcf08c34ad76e29969
font_01_sfnt_off0000ffe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE1 10212 bytes
SHA-256: 3bc596a2852feedbc0fdbe3bbe8d94303b3759b8edb1b11972fbc0eff7d98ebb

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