Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70431b91d4c9c3b…

MALICIOUS

PDF

74.5 KB Created: 2021-09-19 17:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5c152478b2eac48c2afc4e03a0ec4bde SHA-1: 4bbbc786b2b7634ecd316b1a0a575ef853229f1b SHA-256: f70431b91d4c9c3b13f24bcc1ff613709ff936f583b49eab7b977b897b602584
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a link farm detector and a machine learning classifier, indicating malicious intent. The document contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of many external links and the link farm heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://hojoairport.com/images/file/muwezovorekizutu.pdf In PDF document text
    • https://brianhigbielaw.com/UserFiles/file/xofefo.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/zafogizebusuwoba.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/zinogedinogomuwobixalijis.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/rogoro.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/sanirapatijidetojopelab.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/24300111393.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/21354814847.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/92576703137.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/27130393926.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/diwuxuzom.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/daxabo.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/33772680403.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/35744271623.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/56236406099.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/3903334644.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/44923220434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+hide+messages+in+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1C 10728 bytes
SHA-256: b3b1e6fa689955d5fbfd141cc6c52cb3761d0bbae49c00ee5e8c369066507577
font_01_sfnt_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 17868 bytes
SHA-256: d4b74923a1373f208cac337b9162632f5a8dd86a3fc5697d8148c4e05f705ca0
font_02_sfnt_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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