Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e064e71e213ed0…

MALICIOUS

PDF

118.0 KB Created: 2021-03-21 22:57:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 986f7c9b586937f60d8e399e4d5276e6 SHA-1: a4582186e518fe4f0d11cf5932e94ec3c5dd4597 SHA-256: f8e064e71e213ed0654bab980e9c74e1e63e6fd642b553d8b60e6949e0482aa5
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's part of a phishing campaign, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9519

Heuristics 4

  • 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 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
  • 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://jacksth.ru/award?keyword=bayesian+approach+pdf PDF link annotation
    • http://xorelurisadadun.iblogger.org/4116429357.pdfIn PDF document text
    • https://kesozelakix.weebly.com/uploads/1/3/5/3/135300748/9790070.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/hTgcuie/33818646101.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457005/normal_5feb5d477b41f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372985/normal_5ffbe04bd1c0b.pdfIn PDF document text
    • http://tebaxedo.22web.org/rozivavajevezetomiv.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/7thboBX/25726188732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406785/normal_6031f4d92dc8b.pdfIn PDF document text
    • https://nujusokomofevak.weebly.com/uploads/1/3/4/5/134503883/nirabojilabesenuk.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/bewibiwat/barfi_full_movie_free_in_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b24278e9-08ed-4afc-b5c0-b8b172f4d202/nail_salons_near_me_open_now_cheap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cac4041-76f7-4b20-916b-3f83cdd74991/botuvatavedutolabozipafix.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/50841231446.pdfIn PDF document text
    • http://vedaremix.epizy.com/does_apple_watch_sync_with_android_phones.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/faisons_connaissance_worksheet.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B193 5072 bytes
SHA-256: b2f1ebab254022e556e6bfc5eab486b465a8b733fe74d7099eceb42edd157ebc