Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4baa737903ce0e7…

MALICIOUS

PDF

71.8 KB Created: 2020-11-10 07:45:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 4c590104c963c36750aabb8365d909c0 SHA-1: de5becdaf1445d10f76dd0de40c81d9c287612bb SHA-256: a4baa737903ce0e760d0b42ba3211c108230bc89eeaae9e78a8df8954764223a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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 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://traffking.ru/strik?keyword=med+cat+herbs+warriors PDF link annotation
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/ruwitawogo_rusajexedav_lusepapa_takibikezuro.pdfIn PDF document text
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/foxulinabosuzu.pdfIn PDF document text
    • https://fenawivo.weebly.com/uploads/1/3/4/0/134000055/pixodomaxubux.pdfIn PDF document text
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/fijozazubo_liwinidamesev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451757/normal_5fa98e850ae1c.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/lipajojaladi_mivatitulu.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/1c99224bbb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5f8ff6a3926ad.pdfIn PDF document text
    • https://kirobobu.weebly.com/uploads/1/3/4/5/134593563/gojamalitaxasiginad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb5bdcb-712a-4a2d-ade8-ba968b01e244/76627709847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e59e6d6d-5826-40b7-86a7-0d646620e24f/6_goals_in_the_preamble_of_the_constitution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b472352d-4857-4538-9ce3-960b4bd44440/palme_kimya_11.snf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7fa8f35-0000-463f-a11e-4c5e1b9f34dd/89612469535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e08415d0-e2e4-4126-b6a7-cd067530b9bf/wuxinuwipesomorisov.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_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 5232 bytes
SHA-256: d0a01d7c0ab145fca9830b0851e59cb934cf840f943730dfd1f3cfa28a439dbf
font_01_sfnt_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 11420 bytes
SHA-256: 8781581dd295048b03155ae32aa94265af61238a8ba8fe4090d5322af102c498