Malicious PDF — malware analysis report

Static analysis result for SHA-256 44427169ca7f7fa6…

MALICIOUS

PDF

62.3 KB Created: 2020-11-19 04:21:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ffb2aa50008bcc99a156dce64353592b SHA-1: d21a7b681b87345f6558bcbe6120b53241d24d13 SHA-256: 44427169ca7f7fa60178c52b076c0a27b5bae584d7d7db53934eb1f6f7ca5fc1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafficel.ru/strik?utm_term=essentials+of+anatomy+and+physiology+7th+edition+scanlon PDF link annotation
    • https://molireju.weebly.com/uploads/1/3/4/6/134630509/ruduz-gepal-weravul-dararudutitunu.pdfIn PDF document text
    • https://jixisejilikabow.weebly.com/uploads/1/3/4/2/134265892/gusawak_kidevazisu_lugubozedive_bifurakeduza.pdfIn PDF document text
    • https://tanezogifa.weebly.com/uploads/1/3/4/3/134321065/tumodifado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387704/normal_5f97327dc46ca.pdfIn PDF document text
    • https://dabagurujor.weebly.com/uploads/1/3/4/3/134350609/dofan-vugizekad.pdfIn PDF document text
    • https://luwinititik.weebly.com/uploads/1/3/4/5/134587042/rulipibu_xolukezi_mutelawajiwavo.pdfIn PDF document text
    • https://gupebaxederor.weebly.com/uploads/1/3/4/6/134691072/gonara_ditemibupidez.pdfIn PDF document text
    • https://feliwisinawo.weebly.com/uploads/1/3/1/8/131856919/719752554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393761/normal_5fad6742b453a.pdfIn PDF document text
    • https://webuxeneme.weebly.com/uploads/1/3/4/3/134368634/fumeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4698f811-7ce3-4c5e-a7cc-a1e3dcff94c6/bujifetomozo.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/poboverazaboledexetej.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/21108664561.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC38 5400 bytes
SHA-256: 1409b2980a0f696a0ab066164c0734b3ad75f3cdcd269d874a895f8653d26ed1
font_01_sfnt_off0000be81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE81 9204 bytes
SHA-256: 8e00a9c10ef82bd1fa450c76cedfbf5910de5af6ecaf2e0efc5864e433d00c2a
font_02_sfnt_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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