Malicious PDF — malware analysis report

Static analysis result for SHA-256 801b350d3923bb96…

MALICIOUS

PDF

76.1 KB Created: 2021-05-21 13:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: da099e6d867da9c82cdbec27753aa23c SHA-1: 5bbf1a749dd61a3dbc1cf5a46ae8adec261c114a SHA-256: 801b350d3923bb96a44e27b1be7a842793e287d4973629d7d5a714b032c2d9ae
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of the 'utm_term' parameter in one of the URLs indicates a potential tracking mechanism for a phishing campaign. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://baarspo.ru/strik?utm_term=msci+acwi+ex+us+value PDF link annotation
    • https://dofopukirisozut.weebly.com/uploads/1/3/1/4/131437491/vajabezilujudi-bizurotizevezer-xosetoz-mawoze.pdfIn PDF document text
    • https://firupafawaxif.weebly.com/uploads/1/3/4/1/134109114/df2c32aa.pdfIn PDF document text
    • https://patoduwewoz.weebly.com/uploads/1/3/1/4/131483118/bolanizurol.pdfIn PDF document text
    • https://tujazewus.weebly.com/uploads/1/3/6/0/136028127/zuvuser-wejabe.pdfIn PDF document text
    • https://bukajovogasis.weebly.com/uploads/1/3/4/3/134340533/4068482.pdfIn PDF document text
    • https://witudaki.weebly.com/uploads/1/3/4/3/134332653/b587e0d399c.pdfIn PDF document text
    • https://bodizolisasutez.weebly.com/uploads/1/3/1/8/131871954/44e6c.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/1b30129a-e80b-4106-8d27-2d94961e5cb5/what_is_student_engagement.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/samsung_scx-3405w_factory_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9acd165-5a7c-4c53-bdab-53e39b53482f/bikixuwamukexamifuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e86f1c-ef9e-4ed4-a40a-3a2d09a91186/9434376480.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/98869401350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/134e6f25-6f4c-480b-91bb-51d87a9443b7/zavudatuwevifivipunofafog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b92f909-a189-4841-95c1-a3522bd58ae9/mini_dvi_to_usb_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d41c79-c4a8-4f97-8eb3-d14c558e7705/concordancia_biblica_mistral.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/muzofasawipixe.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_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 4920 bytes
SHA-256: 4f2b5c555743f46a0e62a16b2f8ccbc7c2ec4ea942848f502dd52a3582548cdd
font_01_sfnt_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 11608 bytes
SHA-256: aacc70983b23e700e63fd9971d0051836103a91844de30a4911b9f31519c962e

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