Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd4b1fdae8ec0c3…

MALICIOUS

PDF

69.2 KB Created: 2021-02-18 12:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 170c4f78aab7b1efafbe631d6a469c28 SHA-1: f56394042746baa50ca463b8c966748a41508adb SHA-256: 6bd4b1fdae8ec0c3239932adcfb408c7a2790579585b9d1aee02df8478db8880
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one that impersonates a Royal Mail tracking link, suggests a phishing or credential harvesting attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is part of a link farm hosted on disposable infrastructure, designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=royal+mail+international+tracking+number+example PDF link annotation
    • https://zuvofuguwapu.weebly.com/uploads/1/3/4/0/134042474/segowarefaj.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/feihgxv/govodel.pdfIn PDF document text
    • http://znakomstva69.space/route_vs_route_pronunciation4l3v7.pdfIn PDF document text
    • https://junurewumopu.weebly.com/uploads/1/3/2/7/132740614/5f2321c82ab4.pdfIn PDF document text
    • https://kowijifeno.weebly.com/uploads/1/3/5/3/135390944/mativosobiludop_ruzupipev_sepazokatiti_pezen.pdfIn PDF document text
    • https://cdn.sqhk.co/kelanadu/jhhebEe/plama_marble_run_2d.pdfIn PDF document text
    • http://grampus-shop.com/97773056773gvap0.pdfIn PDF document text
    • https://jovovanin.weebly.com/uploads/1/3/1/8/131871717/rumonixit-pifegisojor.pdfIn PDF document text
    • https://cdn.sqhk.co/kosenopelid/ifhchaE/fimigekokid.pdfIn PDF document text
    • http://raisinshq.pro/xurakifawawutc2xmt.pdfIn PDF document text
    • http://trendmobile.ru/fishing_training_guide_osrsaa3pn.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/dovulavavo/qualified_audit_report_on_going_concern.pdfIn PDF document text
    • http://fijudixisofuzat.rf.gd/99197326290.pdfIn PDF document text
    • http://jasagedonemope.epizy.com/velopitetewajejopimejeda.pdfIn PDF document text
    • http://mumazidujinodu.epizy.com/sukulotajut.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_off0000d0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D2 5456 bytes
SHA-256: 49f7b8cc1137e3e07d1a8a9b5cdb58a22e63387342d1ba759bbecf28a9d55379
font_01_sfnt_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 10668 bytes
SHA-256: d1336d9a85e9b3a535517e227e391f2d16a6fad81c3199b047766bfedbd11dc5

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