Malicious PDF — malware analysis report

Static analysis result for SHA-256 911864cf286d322e…

MALICIOUS

PDF

81.0 KB Created: 2021-02-23 12:50:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cce97e8bb04781fac28b6082b36136d9 SHA-1: 0e2b111b08987fb62d0ebdd8d6245b624b95f5f7 SHA-256: 911864cf286d322ed14c8f42cd3a7381942728bda7ac1a145a442097e871f157
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external websites, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated and appears to contain junk data, but the presence of many external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/wb?keyword=kubota%20svl75%202%20engine%20oil%20capacity PDF link annotation
    • https://vazejaxos.weebly.com/uploads/1/3/1/3/131382607/ropusozibu-muxexomakuruga-rasetukoparuk-kubut.pdfIn PDF document text
    • http://podarokinsta.online/linux_shell_script_arguments_examplecfb13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_6016ddcd6b41e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476133/normal_5ff9356ced9b1.pdfIn PDF document text
    • https://nigerizebamogut.weebly.com/uploads/1/3/4/5/134596745/8ba78.pdfIn PDF document text
    • https://wutotopuwa.weebly.com/uploads/1/3/4/4/134464713/texexef_tajag.pdfIn PDF document text
    • http://latuha.com/what_happens_if_you_get_hurt_in_army_basic_trainingp0eru.pdfIn PDF document text
    • http://ewop.space/modafobipozevt2b8o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417670/normal_5fced330007b6.pdfIn PDF document text
    • https://rozuguki.weebly.com/uploads/1/3/0/7/130775318/geronezeturigi.pdfIn PDF document text
    • http://redit.fun/c._a._t._s_mod_apk_android04xla.pdfIn PDF document text
    • https://visofebofoxofub.weebly.com/uploads/1/3/0/8/130814652/01fdcb810e7.pdfIn PDF document text
    • https://kanevedodusuwa.weebly.com/uploads/1/3/0/8/130814441/2792233.pdfIn PDF document text
    • https://verumoxozuvije.weebly.com/uploads/1/3/1/4/131407377/xagumefud.pdfIn PDF document text
    • http://espaceabonnes.com/nautical_almanac_2019sa4ep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494430/normal_5ffd61983a662.pdfIn PDF document text
    • http://rusherx.studio/electrical_engineering_dictionary_apkr3q9l.pdfIn PDF document text
    • https://dozunetad.weebly.com/uploads/1/3/4/4/134472758/zikeneg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ffe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 5612 bytes
SHA-256: 1abdee07535e7615c9fe0f68edd98dc7d5fc4f754659f543dee81607d7b195c6
font_01_sfnt_off0001133a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133A 10476 bytes
SHA-256: c23f4f7260da8176db81c323c39cb9565d50d4847d0c4235681d5aded6897da5

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