Malicious PDF — malware analysis report

Static analysis result for SHA-256 162243e0e378ba4d…

MALICIOUS

PDF

81.8 KB Created: 2021-06-12 23:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 128c45d7452fbdba24f6f03c1e5c0551 SHA-1: ac2feab465e13995888c57102ce15089b977bcb1 SHA-256: 162243e0e378ba4de3da8a45bbb2e5fb6055a72dcefc90e5f06e9c0dd7623784
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicative of a link farm designed to redirect users. The presence of 'utm_term' parameters suggests tracking or phishing campaigns. ClamAV detection and ML classification strongly indicate malicious intent, likely to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://huntic.ru/pbw?utm_term=tiberius+stormwind+death PDF link annotation
    • https://godewofevi.weebly.com/uploads/1/3/2/8/132814364/778a422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386606/normal_60531546e84b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486745/normal_603975ed188ca.pdfIn PDF document text
    • https://jipafopabos.weebly.com/uploads/1/3/3/9/133986828/929f31721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402745/normal_6058a12215ce3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_6015912e4e7e5.pdfIn PDF document text
    • https://tenanetudoji.weebly.com/uploads/1/3/4/2/134266315/dapodawunomo-ganow-modur-tebis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450439/normal_5fe79c427c365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_6012207602d04.pdfIn PDF document text
    • https://gijidibeb.weebly.com/uploads/1/3/4/7/134702067/4776278.pdfIn PDF document text
    • https://sagezawi.weebly.com/uploads/1/3/4/3/134322896/fojul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_6063506bc6764.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427499/normal_6002877908b6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476142/normal_5fee9cd8aca55.pdfIn PDF document text
    • https://tumavogadagakep.weebly.com/uploads/1/3/4/7/134721967/6552794.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/1035665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_601b0e64b1f05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462993/normal_5fd3acf4b0fd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378830/normal_5fdf4eb3e639b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426424/normal_5fe9eac2c3b5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417309/normal_5ff5a3279743f.pdfIn PDF document text
    • https://tilipigenetuwa.weebly.com/uploads/1/3/4/7/134770736/6698991.pdfIn PDF document text
    • https://bijasekimuku.weebly.com/uploads/1/3/4/5/134593614/bovetaj-junir.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_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 5216 bytes
SHA-256: 3b33637c81b565c467e5f0175b9e5a5107e513e8327752b9379d9d50aa7b8e35
font_01_sfnt_off00011336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11336 11436 bytes
SHA-256: c68fb76c7f8fe00c19d8e9cde7b40aa3a0d1f698db0ad70f3bfab4a2998f0fda