Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e5cac2f755804d…

MALICIOUS

PDF

72.3 KB Created: 2021-02-17 11:46:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d1e137aee84d652680907dd7e6b36dae SHA-1: 951b24e6c1bf6afc985c9778834bf07d89e03fb2 SHA-256: c0e5cac2f755804d719511da1f77d4b6bf386f7f0984c26be93cc9c30ce3734d
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL being https://baarspo.ru/strik?utm_term=d+d+5th+ed+ita+pdf, suggesting it's part of a phishing campaign. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses urgent language to prompt user interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://baarspo.ru/strik?utm_term=d+d+5th+ed+ita+pdf PDF link annotation
    • http://weareanonymous.org/gebojapa1qxpm.pdfIn PDF document text
    • http://moitender.org/adnan_syed_stephaniew5dve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5fd7d39d00d0c.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/hdWgeRM/rabbit_magic_adventures_free_download.pdfIn PDF document text
    • https://murafasonuralab.weebly.com/uploads/1/3/5/3/135398902/wofenikajuzovet.pdfIn PDF document text
    • http://umniashka.ru/namugoborevituleruxanvjhk.pdfIn PDF document text
    • http://trend-sales.fun/lebinikolasokidiseh54.pdfIn PDF document text
    • http://voicebftyi.com/how_to_replace_honda_civic_door_lock_actuatorl1267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459463/normal_6028a2fc01ada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448137/normal_6026fc006a336.pdfIn PDF document text
    • https://bawobejeburojax.weebly.com/uploads/1/3/1/1/131163695/7971097.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/bulujono/94992302578.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/xonat.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/82049832573.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_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 4948 bytes
SHA-256: 07b2aa8fdd5d92d247df4ee51f499a74f0ef389a7b1429b1feefa7ce35adddeb
font_01_sfnt_off0000edad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAD 11488 bytes
SHA-256: 0f34e15067787409eb8fa662c95f7f9686c4232ad2f9137f61981407e3e64b6f

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