Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9242c707119b45…

MALICIOUS

PDF

88.6 KB Created: 2021-01-31 01:56:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 13f4770fe1710b2fe2df2cd69388b7de SHA-1: d932a3941f7bd2a218e6e3e042c118f2060d6f84 SHA-256: 3c9242c707119b456711391f93e7ca13fe06c44601a0c52d92b382d949130d6c
242 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to disposable hosting or redirector services, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9622

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=swgoh+c3p0+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4495262/normal_5fdb4054ba787.pdfIn PDF document text
    • https://gawenowufiwozup.weebly.com/uploads/1/3/1/3/131383543/rusuvaguju.pdfIn PDF document text
    • https://cdn.sqhk.co/pitekofotada/jcgeCgd/33823781957.pdfIn PDF document text
    • https://katalulipof.weebly.com/uploads/1/3/2/7/132710678/3868760.pdfIn PDF document text
    • http://dutov.org/challenger_foosball_tablet5fe1.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/gik2jbg/18882484225.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/eSphaZt/79144149552.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/eKijzig/nikon_70-_300mm_vr_lens_review.pdfIn PDF document text
    • https://talipugetajizan.weebly.com/uploads/1/3/4/8/134862074/3250277.pdfIn PDF document text
    • http://prizinsta365.site/8193602714ir7rx.pdfIn PDF document text
    • https://cdn.sqhk.co/kafexobesa/IhejhrR/fuvosovewenumodobowasavoz.pdfIn PDF document text
    • http://prod-fruit.space/leet_servers_list02c0u.pdfIn PDF document text
    • https://vejikawotepux.weebly.com/uploads/1/3/4/8/134887167/zepoponozojarebuf.pdfIn PDF document text
    • http://relax35.ru/pezufejokordb5.pdfIn PDF document text
    • http://nicechange.space/nosimenaxukifo0nv1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_6015e5292d9cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460981/normal_5fec145b299e9.pdfIn PDF document text
    • https://cdn.sqhk.co/pabukerofo/ijicjgc/angry_birds_friends_level_60.pdfIn PDF document text
    • https://xebubezapabiw.weebly.com/uploads/1/3/5/3/135327697/c711f9a6.pdfIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000146ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AD 5756 bytes
SHA-256: 993872ccbf192c54b18985c8b8a1f084b5e59f7a49ad6cb43b265a17d8f127bf

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