Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24e25fd4cfda294…

MALICIOUS

PDF

76.5 KB Created: 2021-02-22 19:14:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 4a2a9ca6000228ce8a80ef14b3608133 SHA-1: a01204486dc59d04fb45c2ab6b05b0e82c2fa522 SHA-256: c24e25fd4cfda29400b448d8b6ce0969edcc7b0d0fde52b4ff4f63865dfbf220
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing and link farm attack. It contains numerous external links, many hosted on disposable domains, designed to redirect users to other PDF documents. The document body, though heavily obfuscated, appears to be a lure related to downloading a PDF about changing one's brain, likely a social engineering tactic to encourage downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/wix?keyword=words+can+change+your+brain+pdf+download PDF link annotation
    • http://heleogose.online/32146232373eb4dc.pdfIn PDF document text
    • http://899themes-demo.ru/83783941044iyl0n.pdfIn PDF document text
    • https://letavozogat.weebly.com/uploads/1/3/5/9/135978758/vujivobakogowalas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_60316d8420b22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446017/normal_601062245d501.pdfIn PDF document text
    • https://nexuragero.weebly.com/uploads/1/3/4/7/134751893/4555801.pdfIn PDF document text
    • https://giderolimarova.weebly.com/uploads/1/3/4/0/134098849/bibipatilururemo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385887/normal_5fc5c5efd5df8.pdfIn PDF document text
    • https://kitivagep.weebly.com/uploads/1/3/0/7/130775950/gidividesetuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_601a9fcfdbe31.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/kTOkKgf/7131159158.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407302/normal_602e2f2a96157.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384159/normal_5fdd914b16bdc.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/hidkegc/anti_aircraft_missiles_on_white_house.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/operations_manager_resume_exampleswpufj.pdfIn PDF document text
    • https://vipegiwofavagob.weebly.com/uploads/1/3/5/3/135302795/6592150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474222/normal_602253ea7bfe9.pdfIn PDF document text
    • http://lessonsonline.site/buitoni_ravioli_nutrition_informationjgbpn.pdfIn PDF document text
    • https://cdn.sqhk.co/zezaxemepe/hjghdsp/5715340063.pdfIn PDF document text
    • https://bifixebuwo.weebly.com/uploads/1/3/0/7/130776276/murunexinabaga-lepavapete-dedamixonoz-soxok.pdfIn PDF document text
    • https://dipalowijoje.weebly.com/uploads/1/3/0/9/130969855/sumaxozokosoz.pdfIn PDF document text
    • https://zogugixuwomu.weebly.com/uploads/1/3/4/2/134234599/madatamuduvi_niwewat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368996/normal_5fe3c0d9d7a26.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_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 5764 bytes
SHA-256: 4ddbc80d69cc04772a8a6a794c3011d1f381b5c0d8a719785a038005eb7ea0a5
font_01_sfnt_off0000ffcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 10640 bytes
SHA-256: 93b81f41b07d34882432466ec5719cfb0d11fec8c0d04e4aeaab08aa31170dfb