Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f31df3fb6fce52b…

MALICIOUS

PDF

77.9 KB Created: 2021-03-30 07:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f57db084383163ec47f1e1ba10fe2fd5 SHA-1: e901af35f1061b496ea8c336cac7f80d48668dce SHA-256: 6f31df3fb6fce52ba205df05e2ee992b4d1a03c6fca111ee14f8ea9e0dc216fb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The 'DOC BODY' content, though heavily obfuscated, includes keywords related to a bible reading plan, likely a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://baarspo.ru/award?keyword=catholic+bible+reading+plan+pdf PDF link annotation
    • https://cdn.sqhk.co/rasetiwulipu/g8nKhhx/pofenuriluxezokefil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375071/normal_5ff9ab517c4ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386335/normal_601b455ebc831.pdfIn PDF document text
    • https://cdn.sqhk.co/mafozerekat/NVih4M3/business_intelligence_manager_resume_example.pdfIn PDF document text
    • https://cdn.sqhk.co/dopebuxoz/jfnngcX/momixe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fd86562269a2.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/GgeIhhF/55371627819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387808/normal_603ed642280df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_60243fa99f60a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445892/normal_5fdf82dee86c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421780/normal_5fdc01109d36d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476282/normal_5fd0583a9a75c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459325/normal_5fde2e864b50d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370762/normal_5fc5a6c9556b5.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxozamikoge/fhejagj/explorer_heyerdahl_crossword_puzzle.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_c14d6a1616874064a8fbac2e12bfe650.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_db2f7bdbe14444bfa44737152107d275.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_1eb64578b725432f81150a53bfab2d2f.pdf?index=trueIn PDF document text
    • http://nelivizazepafo.epizy.com/kedobe.pdfIn PDF document text
    • http://gizimup.epizy.com/fekulakida.pdfIn PDF document text
    • http://noworevapetero.epizy.com/44937582889.pdfIn PDF document text
    • http://negorox.epizy.com/calendrier_octobre_2020__imprimer.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_off0000f3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 5284 bytes
SHA-256: b62f83709b728811c38a02b85229e18c6f1e667a47e8608b501434ba04740085
font_01_sfnt_off000105b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 10812 bytes
SHA-256: 4229fcb5c7ced54fd905ca32f9b22857da1feb143809adc7a592542f943049ac