Malicious PDF — malware analysis report

Static analysis result for SHA-256 781b0376aa47bc79…

MALICIOUS

PDF

76.0 KB Created: 2021-02-09 18:40:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e913039be100b9534e6e2eeea3646057 SHA-1: bab713e453bd94e7955a83c225bef7e42c19b7b8 SHA-256: 781b0376aa47bc792c4c22ac36779ab30ede51f1efae2012e976dc78505ffb2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with a critical heuristic identifying it as a PDF link farm. The primary URLs observed are associated with potential phishing or malware distribution. No scripts were extracted, but the PDF structure and link farm heuristic suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/123?utm_term=anima+character+generator PDF link annotation
    • http://cancandance.org/pegazorubex.pdfIn PDF document text
    • https://cdn.sqhk.co/noxutuvixi/widpFjd/warlords_of_draenor_raid_sets.pdfIn PDF document text
    • http://dostafood.xyz/simple_past_affirmative_negative_exercisesclm20.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxinugokas/sVJuMje/freezero_game_mod.pdfIn PDF document text
    • https://mokomowu.weebly.com/uploads/1/3/5/9/135969792/robipiba-somuko.pdfIn PDF document text
    • https://nosuzodudoj.weebly.com/uploads/1/3/4/5/134588086/3127199.pdfIn PDF document text
    • https://cdn.sqhk.co/xipapotug/pgdDghN/zerirodidovegejuzevon.pdfIn PDF document text
    • http://milanbeachs.space/megatavuzegijutamoxozukohcenf.pdfIn PDF document text
    • http://awpmode.com/advantages_of_non_verbal_communicationlykf9.pdfIn PDF document text
    • https://cdn.sqhk.co/telivagawu/aEiekCZ/47201561776.pdfIn PDF document text
    • http://regse.website/carbide_create_softwarey2hoa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/cd_chininha_e_principe_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/41398649642.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/bangladesh_army_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/gubijod.pdfIn PDF document text
    • http://maxefaronuxugur.epizy.com/jaspersoft_studio_subreport_connection.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/wadogenazufosarojowizebaw.pdfIn PDF document text
    • http://nanedivelewiwi.epizy.com/8328123738.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/pexepedide.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/beach_head_pc_game.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/kobubajofirepij.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_off0000ed4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4A 4992 bytes
SHA-256: bb80ea9ae5a98d7f12c0efc6ba04cea2d6886656611f687213df4d5c109893bc
font_01_sfnt_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 10856 bytes
SHA-256: ac70f48ce74d2519e5d92e7b8f395cf34a35efb29a34c7092efbee381c12c98a

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