Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2acade27b02c2d…

MALICIOUS

PDF

81.6 KB Created: 2021-02-22 07:25:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6a9921b305c237737edce5508e3e770e SHA-1: a489ce192055004571b5800ed422453d7675cef6 SHA-256: 0b2acade27b02c2dd280bca74f615bba88501b6fa24732cdd9b76a98a01d717a
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to other PDF documents hosted on various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to potentially harmful content, possibly leveraging SEO tactics.

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://jottigo.ru/strik?utm_term=a+christmas+carol+2019+episode+2 PDF link annotation
    • https://fogurasetaj.weebly.com/uploads/1/3/5/9/135961985/badb62bd2f7b.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwopaperuv/139nii8/40897386029.pdfIn PDF document text
    • https://pofimutazotoxo.weebly.com/uploads/1/3/4/0/134000188/1145793.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/Ucgf8Kl/53581130485.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/jfcahcO/xizapilowerixizakaguf.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/PjjNajm/romapamateluxev.pdfIn PDF document text
    • https://woxisuxifajise.weebly.com/uploads/1/3/5/4/135400236/f5ddfa27c6b.pdfIn PDF document text
    • https://radelemetiwiwi.weebly.com/uploads/1/3/4/5/134520029/dunuronetata-gujizap-juxorosewogi.pdfIn PDF document text
    • http://italia-doc.fun/bioinformatics_for_dummies_free_downloadbz1qc.pdfIn PDF document text
    • https://jipunone.weebly.com/uploads/1/3/5/3/135349916/nutovasub-fajawosomese-zufedat-xudonokopinuxan.pdfIn PDF document text
    • https://cdn.sqhk.co/wularumijif/icTjehc/mobanikefesuxujitezew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469365/normal_5fe1891344e06.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/jb38jjv/dragon_city_hack_gems_gold_food_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lazuxorus/ajjg8jb/best_3d_game_maker_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446784/normal_603317eb22aa2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tokeparab.epizy.com/c_books_for_beginners_free_download.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_off00010304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 5784 bytes
SHA-256: 302d4f71c99c662040f600b886d8e216d4f6f652de5431b7cb48ec3bf7a318fb
font_01_sfnt_off00011686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11686 10276 bytes
SHA-256: bb4346fa27b518d2cd2ef6e2aca08d96121b0d67266ff628b3feeebab08c4cb0

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