Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1200c0f7042b7a9…

MALICIOUS

PDF

71.8 KB Created: 2021-06-12 04:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 36a888232a8c0e169ec5f35628e4b2d8 SHA-1: 65b768ed5c1f30f5c727343344ebe0c60679043e SHA-256: c1200c0f7042b7a90b08f2ed8858161b3181baee62e94bab134049e250aa894f
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to potentially malicious websites, possibly for phishing or malware distribution.

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://philabc.ru/pbw?utm_term=delayed+gratification+magazine+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392237/normal_60025012d5627.pdfIn PDF document text
    • https://jatasurow.weebly.com/uploads/1/3/4/3/134358583/fezubiko_vopovuvin_xobiferefufadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_604ba310ec1f4.pdfIn PDF document text
    • https://kefenageteda.weebly.com/uploads/1/3/0/7/130775977/5766858.pdfIn PDF document text
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/xavijopodiparubuz.pdfIn PDF document text
    • https://powadurax.weebly.com/uploads/1/3/4/6/134621507/8cc0de17f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388413/normal_5feb493b02f74.pdfIn PDF document text
    • https://matopudalerem.weebly.com/uploads/1/3/5/3/135318895/825d10a3fbab.pdfIn PDF document text
    • https://kadezejuvi.weebly.com/uploads/1/3/4/6/134603763/tanorewilinuji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401696/normal_5fdbe062c3f7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422371/normal_600362dbcf525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380379/normal_6015dcf2e4b00.pdfIn PDF document text
    • https://nodekisoguzila.weebly.com/uploads/1/3/5/3/135313862/gufipemidux_fujatobokawisa.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/513989b4-f439-4378-b9e2-06d43d01f7f4/positive_words_that_start_with_ra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d10a7dc3-cc05-4c29-b502-05469f089a4e/sosomod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a0f0a36-e293-45ff-bc17-6adf307c0358/reactor_agitator_types.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9791a82e-2360-4260-b071-a3685542027a/30432659668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca30731-ca0a-4252-8945-78980246fd35/how_to_fix_resolution_on_macbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9f281f4-e24e-4e9f-b189-2cf22609c1ed/wanewijugubur.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_off0000da3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3C 5448 bytes
SHA-256: 5eac75f071b931a6342c87939486dccb3a47c3a03b4364fc350a5be4a0cb2430
font_01_sfnt_off0000ecd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 10936 bytes
SHA-256: 042c43049f33b2cde15ac0731b062ae431ac648dcf6814374d31c10db3c44b0b

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