Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fe7678fd69c102…

MALICIOUS

PDF

68.1 KB Created: 2020-11-10 00:46:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 532f3911f3528a7b9975973444a9db29 SHA-1: dbf883d2af05de344851c253bc7b56391c1643ea SHA-256: a6fe7678fd69c102f8ccf8be4b5e72baad960ee72b2caa9470c9a859efb06020
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?keyword=literary+terms+crossword+answers PDF link annotation
    • https://ritixalasan.weebly.com/uploads/1/3/4/2/134265532/8353915.pdfIn PDF document text
    • https://kedasawavofari.weebly.com/uploads/1/3/4/5/134589708/93468c73e2c17.pdfIn PDF document text
    • https://sixexarujizevav.weebly.com/uploads/1/3/4/5/134584368/3c22ed6c8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_5fa260469d0dc.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/velat_zilajamuvabetep.pdfIn PDF document text
    • https://pakezumada.weebly.com/uploads/1/3/4/3/134368128/a18854.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/pusonux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370097/normal_5f8d0d16d7a29.pdfIn PDF document text
    • https://ruwadegefanum.weebly.com/uploads/1/3/4/1/134108857/52e23469f19312.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/saxuvenimugugadeso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393364/normal_5f8ea240e8b83.pdfIn PDF document text
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/a7850825515b5.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/8c3f11ed.pdfIn PDF document text
    • https://matubupediguja.weebly.com/uploads/1/3/4/1/134131452/b53366fcb0.pdfIn PDF document text
    • https://dowamiwimeguv.weebly.com/uploads/1/3/0/7/130775936/vusipigakozizi.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_off0000cdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF7 5188 bytes
SHA-256: a5e107164f0d96cf47246c45c58a1aa479c10d3569af4dedc5fc60bce443e16d
font_01_sfnt_off0000df9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9F 10396 bytes
SHA-256: 0ca41ea88c62c396267172ccb08098c56f3669fbb7e895ba1e9be7de15907140

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