Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6de1531926bfd2…

MALICIOUS

PDF

76.9 KB Created: 2021-06-09 21:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b873f48a6347c37a1a89d95c29fe41f4 SHA-1: 0059f200554b295857a43823e9094c8279b024c7 SHA-256: bd6de1531926bfd25749d83c4d19953d013900cdae707fc151bbfc3ee2d5ec0e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. One of the primary URLs extracted is 'https://nomylo.ru/pbw?utm_term=online+play+movie+app', which appears to be a redirector. The PDF structure and heuristics indicate it's designed to host and distribute numerous other PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/pbw?utm_term=online+play+movie+app PDF link annotation
    • https://musibagufes.weebly.com/uploads/1/3/4/5/134587398/jejexuwiz.pdfIn PDF document text
    • https://xulijijexam.weebly.com/uploads/1/3/1/4/131453336/benezelawuvuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416514/normal_603b51be3b9a8.pdfIn PDF document text
    • https://ladevizeloraben.weebly.com/uploads/1/3/1/6/131606454/4261315.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418991/normal_6002b31bc6a11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445116/normal_5fe8805e11759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381541/normal_600edd297e549.pdfIn PDF document text
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/valonusagume_visanopu_gakoburatu_xopavefaliwip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370077/normal_5ffb3fc508ac4.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/zelidug_sategu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385635/normal_603d71dad57d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374980/normal_600e55c212296.pdfIn PDF document text
    • https://piwaxiru.weebly.com/uploads/1/3/4/8/134882920/1296188.pdfIn PDF document text
    • https://takalipunumaxa.weebly.com/uploads/1/3/4/7/134700228/a021fed77cc2.pdfIn PDF document text
    • https://wazuwivanesigov.weebly.com/uploads/1/3/4/4/134431766/73ca86fb.pdfIn PDF document text
    • https://diwosilanula.weebly.com/uploads/1/3/4/7/134765308/xowoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412173/normal_5fd9387d6671f.pdfIn PDF document text
    • https://radoxawema.weebly.com/uploads/1/3/0/7/130738714/tadarameduwojixi.pdfIn PDF document text
    • https://wipiwabe.weebly.com/uploads/1/3/4/4/134438476/wupalofopamob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://padimagofo.pbworks.com/w/file/fetch/144595641/60424531577.pdfIn PDF document text
    • http://wepoline.pbworks.com/f/4741243285.pdfIn PDF document text
    • http://suniger.pbworks.com/f/advanced_excel_syllabus_2020.pdfIn PDF document text
    • http://kibumezi.pbworks.com/f/jujutesivovemonekolasuf.pdfIn PDF document text
    • http://zeladejan.pbworks.com/w/file/fetch/144441786/libro_aura_descargar_gratis.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_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 4880 bytes
SHA-256: aa33efa1f49fcb667218a2bcb2eed7017bd511594670662dd573df4ba406f01d
font_01_sfnt_off00010166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 10280 bytes
SHA-256: aeaef5494d9b75a779548789c9e69fe0eff3d95f214de5295ce39eb9fa123043