Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c5d9344e58a5b7…

MALICIOUS

PDF

95.5 KB Created: 2021-02-25 18:56:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1859dd7076131f520db0cfc43dec4dc7 SHA-1: 9e542ff32fbaef0c3107bd45e6b2e51861908fc4 SHA-256: f3c5d9344e58a5b720c5b99d7367cb39969e8af7af4ebee353d264333faad442
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 0.9998

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://maypoin.ru/123?utm_term=how+to+cite+a+research+paper+mla+format PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421613/normal_60134bf425f03.pdfIn PDF document text
    • http://ionatr.fun/when_can_a_boy_join_cub_scouts1p17a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460694/normal_5fd7c462d5170.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456985/normal_5ffbdf5c17fa2.pdfIn PDF document text
    • http://tacfitproducts.com/global_citizenship_education_videoi4az1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499999/normal_5ff21e10dfbc0.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/best_myers_briggs_personality_test_online.pdfIn PDF document text
    • https://bopidojosonek.weebly.com/uploads/1/3/1/3/131384153/b88b92.pdfIn PDF document text
    • http://hookup157.site/mckinsey_insights_retail5ggwm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423454/normal_5fe1d9e93ad94.pdfIn PDF document text
    • https://bizutimuja.weebly.com/uploads/1/3/3/9/133999747/penagugunele-tamam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378152/normal_6032b06d84538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412895/normal_5fd0bcf3d795b.pdfIn PDF document text
    • http://jilet1.club/bro_sammy_ft_obaapa_christy_worshipsddch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiwatimab.atwebpages.com/28523435589.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_off000139e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E0 5308 bytes
SHA-256: bd724f0e404526e85b3713e75156b8931e5fa9a11553eed5b2dcc110f686f6d7
font_01_sfnt_off00014bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD6 10932 bytes
SHA-256: 6dd1f49d1c64d9485d05d626f48cb8a425b584cfa9547a768ae89bc108df786e