Malicious PDF — malware analysis report

Static analysis result for SHA-256 9807f6931d2a9944…

MALICIOUS

PDF

72.6 KB Created: 2021-03-08 20:00:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8a5021d7da62c9c8c96cfc5afbb2a14d SHA-1: 5ca6cb6fca21094640006f3624042ac788aaacff SHA-256: 9807f6931d2a9944d29a182180f56c1ac2a414dedd894992fa3a07288c90d2c7
186 Risk Score

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 0.9998

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 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://nipisod.ru/wix?keyword=crack+the+code+puzzle+answer+key+427 PDF link annotation
    • https://tobevasisutigi.weebly.com/uploads/1/3/0/8/130814636/wifag.pdfIn PDF document text
    • https://cdn.sqhk.co/vibifexode/1tgjjed/zusoronimolosex.pdfIn PDF document text
    • https://sozobuxetezubu.weebly.com/uploads/1/3/4/5/134527793/9698491.pdfIn PDF document text
    • https://cdn.sqhk.co/jadizefon/avhbvjK/51161486263.pdfIn PDF document text
    • http://dreabling.online/download_cheat_ultimate_motorcycle_simulator_mod_apkxwdt8.pdfIn PDF document text
    • https://cdn.sqhk.co/pevedapev/gyjfIhg/snapping_turtle_diet_wikipedia.pdfIn PDF document text
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/baxekewidil_xozatutedit.pdfIn PDF document text
    • http://kyhni.site/lolegejofebuku8gs2w.pdfIn PDF document text
    • https://lukidamovepuk.weebly.com/uploads/1/3/1/4/131437538/tetujupufovo-tuvamo-xenikokekobi-fizugawox.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/jiiiijg/razotimal.pdfIn PDF document text
    • https://xovonugobo.weebly.com/uploads/1/3/4/6/134688771/wilubofitetar.pdfIn PDF document text
    • http://rawoferifexa.22web.org/64029953190.pdfIn PDF document text
    • http://lotsmen.com/faparinalidhklu4.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/xakajoziwibi/tarogarami.pdfIn PDF document text
    • http://foluxosanoxawat.rf.gd/tupaferuxup.pdfIn PDF document text
    • http://zulebolaj.rf.gd/83044214657.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/dilot.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_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 5676 bytes
SHA-256: a0c9bf320379df83bb59fb9879de88d233d97a8f53fb968a4239d9eaadd4ca7f
font_01_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 10412 bytes
SHA-256: 5408ea1d5c07c2eeefddfdee821416cdf9b6f6ab03722ef2271c9095dbf424d3

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