Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8047b6281cd4b2…

MALICIOUS

PDF

64.5 KB Created: 2020-12-13 22:49:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fab07661ede13bff881831d1911d6fb8 SHA-1: 1d40afe94dc3348ee80067f259af8305e876d4bc SHA-256: ff8047b6281cd4b21ef51f25dd856b8221422a172a58babe5302f23a45692bc8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant portion pointing to disposable hosting services like Weebly, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lead users to compromised or malicious web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://traffking.ru/strik?utm_term=mhw+research+ticket+plus
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/funifovi.pdf
    • https://sewuvemap.weebly.com/uploads/1/3/4/3/134377394/3940605.pdf
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/56692e94a71.pdf
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/nexixubi_fetif_pojamifibazimeg_rurazogexigi.pdf
    • https://vugifalufaduzo.weebly.com/uploads/1/3/4/8/134889855/044cd80bc9a.pdf
    • https://cdn-cms.f-static.net/uploads/4410730/normal_5f93ba390faee.pdf
    • https://fanofowos.weebly.com/uploads/1/3/4/5/134576313/sizikasesige.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zuses/75534642800.pdf
    • https://static1.squarespace.com/static/5fc54079ea4a794d5661c0f1/t/5fd1d8b07cf94534dc5ccd84/1607588017339/gowifodapavix.pdf
    • https://static1.squarespace.com/static/5fc1a921df132613bbc31d79/t/5fc4cf03f8cdb769c67a76c2/1606733575008/53190767222.pdf
    • https://static1.squarespace.com/static/5fc0d67b8ef7301f8b106140/t/5fc1ab4164571256547b2b0b/1606527809894/you_raise_me_up.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000abca.bin
09d715cbd06b6d764327da6789c037361bb827e251e86da2e881c6bc408c36ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xABCA 5180 bytes
font_01_sfnt_off0000bd82.bin
f2ee672a977b8d65286e53144b41713569606a9bb6b16143130a8ff8055cb284
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD82 10124 bytes
font_02_sfnt_off0000e02d.bin
2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140
pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 16092 bytes