Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a3067a3f9f551b…

MALICIOUS

PDF

85.6 KB Created: 2020-11-11 23:12:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4ee6a5f044ea625d6299ed235096041b SHA-1: 116ecf29e61b4044a9f9430e57d1ec42a70dfa13 SHA-256: c8a3067a3f9f551b2a715892449de294229eb41a2bb44379e654afe7ae207bfd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9996

Heuristics 6

  • 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.
  • 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://trafffe.ru/123?utm_term=computer+laboratory+rules+and+regulations+doc PDF link annotation
    • https://jimagofer.weebly.com/uploads/1/3/0/8/130813953/4016120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408176/normal_5fa8448ca73b7.pdfIn PDF document text
    • https://sekulawovow.weebly.com/uploads/1/3/4/5/134578441/donapa.pdfIn PDF document text
    • https://zagusopiv.weebly.com/uploads/1/3/4/2/134234894/83b951f.pdfIn PDF document text
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/8f8a6f33.pdfIn PDF document text
    • https://revibafejinaj.weebly.com/uploads/1/3/4/4/134485322/7491f8154.pdfIn PDF document text
    • https://wipaluxeko.weebly.com/uploads/1/3/4/3/134346688/wigavuv_ropivisom_rerariretise.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/tapexiw/xivis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/362c5a1e-2bfd-4fbf-b50f-b978aac43651/libegepogukudid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe45504b-2ced-4393-9a62-341694d2620a/xapowoxajevidirisajudij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/964de28a-5a46-4ad0-b9c3-62dda07e3eaa/photive_cyren_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a2d2ad-0889-47e0-9cdd-9328d2f178e4/74706705345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20f7e3ab-b9fc-4524-be81-36c555016117/deadpool_pelicula_completa_espaol_latino.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B6 9100 bytes
SHA-256: 763c6637df17a63e6acbc651e15c4ce2b8662e2305d851068d54125c59ba8f30
font_01_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 5540 bytes
SHA-256: cb090819084d22ba55ed461686146a9b8c229629678b80c9fbc5dda5cb381f39
font_02_sfnt_off00010341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10341 13064 bytes
SHA-256: cded8b9dee9f6835bda886a753f7c19af197183c6e2e51bdea483aa2aea032a1
font_03_sfnt_off00013017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13017 16348 bytes
SHA-256: 71884952442a2d16660e523984cde8bc24db8172985fa7bf10fae14d19e3b008

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