Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9d21b286d0a641…

MALICIOUS

PDF

68.1 KB Created: 2021-03-24 07:50:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2bf707ffd8b4e0415f1d6b1f98ffccc1 SHA-1: 4ad59e7e81266f7a990d15f355bcfa38e89e6607 SHA-256: de9d21b286d0a641ecbba831eccf624ececbb342a702056964213a178c3e6c39
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique commonly used for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a PDF_SEO_LINK_FARM heuristic suggests the document is part of a link farm designed to attract traffic and potentially lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/award?keyword=online+converter+pdf+to+word PDF link annotation
    • http://bajesiradevo.getenjoyment.net/que_es_hidrostatica_en_fisica.pdfIn PDF document text
    • http://ratixopawem.mypressonline.com/labugosezodorutawen.pdfIn PDF document text
    • https://fajizaxaro.weebly.com/uploads/1/3/1/3/131381717/5283610.pdfIn PDF document text
    • http://dofibiz.22web.org/sims_3_pets_3ds_cheats.pdfIn PDF document text
    • http://nujerizura.iblogger.org/reinforced_concrete_design_sample_problems.pdfIn PDF document text
    • http://tavafotuzefox.sportsontheweb.net/samsung_smt-c5320.pdfIn PDF document text
    • https://wabibazo.weebly.com/uploads/1/3/5/2/135295983/gopel_vivuta_bunumo_lapabonedezur.pdfIn PDF document text
    • http://sobebal.22web.org/pikewedadimipudavi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pekomuvave.myartsonline.com/pdf_preview_handler_for_vista_outlook_2007.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/how_to_become_a_certified_barista_at_starbucks.pdfIn PDF document text
    • http://memuwalarike.rf.gd/bobuvowovaxeta.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/binoculares_tasco_essentials_10x25_review.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/how_to_dispute_transunion_credit_report_form.pdfIn PDF document text
    • http://zisafarur.epizy.com/23004828953.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/game_khelna_hai_game.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/53324990333.pdfIn PDF document text
    • http://numumodi.epizy.com/apostrophes_for_possession_worksheet.pdfIn PDF document text
    • http://jepojofugag.rf.gd/20851298915.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/gejusisin.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_off0000cd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8C 4940 bytes
SHA-256: 709ace4eb4a1224b717c4fa92b0b8f35d4bd801e7a2da23595498003ff3b007b
font_01_sfnt_off0000de85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE85 10800 bytes
SHA-256: a241d88df7359f9350c9152ebe5b140639c78791fffec765b3b70ea8c7d34ed0

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