Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8fca40770ccbbd9…

MALICIOUS

PDF

78.8 KB Created: 2021-03-17 21:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4857305d9eb2abc4f4a81e009696ce0a SHA-1: ae36a1ccd2b258815ccfa0bc4b0eb06fed9fb06d SHA-256: a8fca40770ccbbd9750d123cc5e2014b0b29f237098eb32e08d104e686c7cc84
244 Risk Score

Malware Insights

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

This PDF file is classified as malicious and contains numerous links to external websites, many of which are hosted on disposable domains or known malicious redirectors. The document body, though heavily obfuscated, appears to be a lure related to 'American revolution battles webquest pdf'. The primary attack pattern involves directing users to malicious infrastructure, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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 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.
  • 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://yafferge.ru/123?utm_term=american+revolution+battles+webquest+pdf
    • http://kawlites.online/download_game_throne_rush_for_pc_offlineehos2.pdf
    • http://comp-arenda.site/halloween_math_worksheets_for_5th_gradext9f9.pdf
    • http://imedo.ru/android_oreo_version_freecwgz4.pdf
    • http://gifinibufenatar.medianewsonline.com/massey_ferguson_35_torque_specs.pdf
    • http://idealicaitaly.site/27353026617mpcei.pdf
    • http://obschee.xyz/zoguwakesexi046bk.pdf
    • http://vozuzutiwajuzip.getenjoyment.net/bldc_motor_operation.pdf
    • http://neuroncraft.online/maggie_mistal_interview_with_denise_richardson_singer6hctr.pdf
    • http://baltika-trans.ru/27552089522d5os3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bavufupuvamopaf.atwebpages.com/81082988006.pdf
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_66d182f3a6fe4da0be9f93fd08b886bb.pdf?index=true
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_413b958645d64237825d52b7e661e872.pdf?index=true
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_d179af0180224b73bcc94cc97df29ba9.pdf?index=true
    • https://56c41596-c8b3-4aa7-a075-23c9724d7f97.filesusr.com/ugd/ed77b2_69c3bc6134ba4218858491988bf67874.pdf?index=true
    • http://kepofif.onlinewebshop.net/vazuv.pdf
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_2a075d9d3c49402e842dd9145ca29b98.pdf?index=true
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_a4098f930e7943cd8676bfaf79f259c7.pdf?index=true
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_b0b729206eb24993951583d2d321a526.pdf?index=true
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_4188cd6100644e9b91d2c644e67accc6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f509.bin
9a85af34308b0341912cfc0b7fde1d7e7826a1a5debff56c47e80fef471d6dba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 5708 bytes
font_01_sfnt_off00010869.bin
77d83c714a3ba9787fa66019705b4e878cdfc62fc424aff7c84b53832a8393f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10869 10952 bytes

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