Malicious PDF — malware analysis report

Static analysis result for SHA-256 3caf5eea2dc5ee94…

MALICIOUS

PDF

79.2 KB Created: 2021-03-13 19:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5f715b664fc61bfb665f1ca36f141e4c SHA-1: cffcaedce81e8c8ef82483c0ace136e7441ce623 SHA-256: 3caf5eea2dc5ee947f944eefc7822fc498f64079c7694fd993bab5c820e4712d
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains or link farms, suggesting a SEO manipulation or phishing campaign. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/award?keyword=the+barbarians+at+the+gate+pdf PDF link annotation
    • https://cdn.sqhk.co/rubalibuzodi/Gqiic3n/22908932313.pdfIn PDF document text
    • https://cdn.sqhk.co/telazaje/hjsZ1YW/space_jam_11_2009.pdfIn PDF document text
    • https://cdn.sqhk.co/vojofarakiva/jcijdZs/towuwalobedozirelan.pdfIn PDF document text
    • https://zadukali.weebly.com/uploads/1/3/5/3/135340438/wikumedukefotoxat.pdfIn PDF document text
    • https://cdn.sqhk.co/sapugelezuf/qcc0Xhd/27831483212.pdfIn PDF document text
    • https://cdn.sqhk.co/notigagamu/vhhigib/narararugop.pdfIn PDF document text
    • https://fubapisa.weebly.com/uploads/1/3/1/4/131406294/70803fa71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382190/normal_601a51338b92d.pdfIn PDF document text
    • https://figapizezedop.weebly.com/uploads/1/3/4/3/134364787/fusopamevogana.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367947/normal_5ff312d7d6248.pdfIn PDF document text
    • http://mexicotop3.xyz/sujimepurekebutenubuddotpd.pdfIn PDF document text
    • http://dvigatel.guru/trade_like_a_stock_market_wizard_book1wl8r.pdfIn PDF document text
    • http://mail-autoscout24.net/rulaluwunewx3nva.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/ji9Dqhc/the_kreator_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417137/normal_5ff128f46f22f.pdfIn PDF document text
    • https://romenazojojeles.weebly.com/uploads/1/3/0/7/130775884/b9e4f7e8414cbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_6011588bd9b34.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/0Rjiahi/diversify_synonyms_words.pdfIn PDF document text
    • https://cdn.sqhk.co/kelanadu/jghan6c/one_punch_man_the_strongest_training_challenge.pdfIn PDF document text
    • http://swiss-gear-top.xyz/advanced_calculus_of_several_variables_edwardsaweev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462986/normal_6000a5c3a6e03.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/xidigaranarapugevap.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/86746430484.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/90884359115.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/72111517314.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_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 5360 bytes
SHA-256: d8447269f0e54bca2f3ed1b0b030026b36dc93d17ec515445f20a92ae5b2864d
font_01_sfnt_off0001092f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 11116 bytes
SHA-256: e260e81929accc4ebc4aa5c27ab6476a1a02f8a4d206f2cb7d6442e51e4ad7a1