Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b0794910a3157e…

MALICIOUS

PDF

37.4 KB Created: 2020-07-02 06:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3e98ef344a2e8f1e17060efb65943ad SHA-1: 1b3f13fb97a036559116d1342d952e3d7d52ed8e SHA-256: 71b0794910a3157e9194e4072433b1487f99c11a1f268cf9058a002e744c16cc
244 Risk Score

Malware Insights

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

The PDF document is detected as malicious by ClamAV and an ML classifier, and contains a critical heuristic firing for linking to known malicious redirector infrastructure. The document body, though obfuscated, contains numerous URLs that appear to be part of a link farm, likely for SEO manipulation or to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics suggest this PDF acts as a dropper or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • ClamAV: Pdf.Dropper.Agent-8907709-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8907709-0
  • 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.
  • 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://ttraff.cc/wp3?keyword=room+reservation+form+template#room+reservation+form+template
    • http://les3l.net/uploads/1/3/1/1/131164270/retozolapilulikivu.pdf
    • http://10000delights.com/uploads/1/3/2/3/132302830/puvefufavajunib.pdf
    • http://mta-sts.mail.lancastercountyxc5k.com/uploads/1/3/0/4/130483155/797304.pdf
    • http://concretecontractorsbaltimore.com/uploads/1/3/0/7/130738863/109eb.pdf
    • http://dementiaenablingenvironments.com/uploads/1/3/1/8/131857029/dc9ef8327.pdf
    • http://mta-sts.mx.lasourceusa.com/uploads/1/3/0/6/130604108/4540183.pdf
    • http://mx.myapolloapp.com/uploads/1/3/0/7/130738837/wetajejit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://jarojadum.files.wordpress.com/2020/06/josexepu.pdf
    • https://sokorirakuzi.files.wordpress.com/2020/06/saveju.pdf
    • https://bexanoru.files.wordpress.com/2020/06/xokepogobudasajazumi.pdf
    • https://busamonavek.files.wordpress.com/2020/06/vidanimebeluz.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005714.bin
a34093c839bb6bf2ddb1f76b952f7a714cc45bea8064d038b63ebb4de51e6584		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5714 4904 bytes
font_01_sfnt_off000067a7.bin
a57c433fe7a257b27b10eda8ceeb83873ff7cb80fcd212f47293ab1a6c52f9b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A7 9836 bytes

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