Malicious PDF — malware analysis report

Static analysis result for SHA-256 661c0fc52c73fdc4…

MALICIOUS

PDF

69.2 KB Created: 2020-12-31 01:13:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cb53666b7af88cd09fbe256e18746daf SHA-1: 21d337d35818dd0635a7367732fa34e9be0664f3 SHA-256: 661c0fc52c73fdc4d02814e036efe19d9b366472dae671ba9e56275a979c124b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to other PDFs, suggesting a link farm or redirection mechanism. The primary URL, 'https://trafffi.ru/123?utm_term=honkai+impact+3+mod+apk+money', indicates a lure related to game modification downloads. ClamAV and ML classifiers strongly indicate maliciousness, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://trafffi.ru/123?utm_term=honkai+impact+3+mod+apk+money PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382619/normal_5f92576b4507b.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/jahjgi2/82801820742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_5fbccdfaa40f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422877/normal_5fbd802f80cd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5f8a24f8f17fc.pdfIn PDF document text
    • https://pavejomesof.weebly.com/uploads/1/3/4/3/134310872/kopekaw_tekinalofivur_ziwotovusap.pdfIn PDF document text
    • https://cdn.sqhk.co/dobexesi/hdG9iga/virabafiwurulekuruz.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/bisiku/pakoja.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/penonevifolurulozunix.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/poguvafulibomazegazosojug.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/badman_binladin_super_free.pdfIn 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_off0000d30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30D 5204 bytes
SHA-256: e4687a8b5606c963fad7048e176b7bac502025c72b5f520d4aa37c633e53c218
font_01_sfnt_off0000e4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 10576 bytes
SHA-256: 543661b13ab4611a9a9e6063c46bc1bb0dcaa01856022e1da13cff89242f92f9