Malicious PDF — malware analysis report

Static analysis result for SHA-256 b639bfd53561a8ea…

MALICIOUS

PDF

72.6 KB Created: 2021-02-11 17:26:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 2fc856f76c39f6a07fe52ec68d1d6ca4 SHA-1: e601d88764d9921bb7f774bca6fe635f9c59166f SHA-256: b639bfd53561a8ea1bc61823f83f0acde8fca05206c19e64941d62c410a6f844
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/wix?keyword=hall+of+bulls+medium PDF link annotation
    • https://xorapuwo.weebly.com/uploads/1/3/0/8/130873927/zufibepe-basosavube-jipirivow.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/107a79e5b922.pdfIn PDF document text
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/nipavuwizageka.pdfIn PDF document text
    • https://juxipidupe.weebly.com/uploads/1/3/4/6/134694928/dudexop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bosadubarelazu.rf.gd/tijujukutef.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/manual_usuario_citroen_c5_2008.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/driving_test_study_guide_missouri.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/60426266538.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/69465146833.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/couple_dance_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/apprendre_le_franais_grammaire.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/stainless_steel_sheet_fabricators_near_me.pdfIn PDF document text
    • http://ralomefin.epizy.com/electronics_engineering_interview_questions_and_answers.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_off0000e232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE232 5056 bytes
SHA-256: 0f22b3d74bdf07d95461284ae06d6519e327fb58674d61bb51b973953be9d9ce
font_01_sfnt_off0000f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 10160 bytes
SHA-256: cc0989487e1495937e86f6bd67145010cb43a3f9733b6073386d87c8629e3bc6