Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa1ff94b03069c4…

MALICIOUS

PDF

72.0 KB Created: 2021-03-05 16:17:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 831c130c9331f875374ac02016731610 SHA-1: 7b2398964c8165aa97fa3b77f7f4b6d9f7bd09ef SHA-256: 7fa1ff94b03069c49e013f6fdf3323e95117b11f0b71cf9914f6767c94e3162e
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a notable heuristic identifying it as a link farm on disposable hosting. The primary URL points to a site that appears to be a keyword-stuffed page, suggesting a potential SEO poisoning or traffic redirection scheme. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://soxebez.ru/wix?keyword=flume+bon+iver+lyrics+espa%25C3%25B1ol
    • http://storeyou.store/xukatakujok37mm1.pdf
    • http://com-connexion.xyz/sebitazatumalekimobubaru1g4m9.pdf
    • https://cdn-cms.f-static.net/uploads/4412164/normal_5fd8253b7bb20.pdf
    • https://static.s123-cdn-static.com/uploads/4414167/normal_5feec7c958659.pdf
    • http://gozaped.iblogger.org/road_accident_reporting_to_police.pdf
    • https://cdn.sqhk.co/miwavilusaji/3dgcUVF/radiant_defense_10_shades.pdf
    • https://cdn.sqhk.co/wixakulu/hgjdhbg/haunted_tunnel_car_wash_huntington_beach.pdf
    • http://smotrikino.fun/norividumetibifoduduvh9n6.pdf
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5fd2e381d6075.pdf
    • http://chunyoo.com/what_is_the_biggest_living_thing_evermzvek.pdf
    • https://cdn.sqhk.co/wagomito/Sjviihd/wunomololopizuderina.pdf
    • http://natiral.space/machine_learning_project_proposal_templatetuih7.pdf
    • https://cdn.sqhk.co/raserijene/wgihfjq/jifadasusedebuvov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6f2d3391-9e99-4691-865b-01ef9ed34f0f/social_studies_mass_media_definition.pdf
    • https://uploads.strikinglycdn.com/files/d41a696a-1905-4079-981d-8cb168e44e92/the_innovators_dilemma_clayton.pdf
    • https://s3.amazonaws.com/jewizopukuni/vitam.pdf
    • http://gufobipadu.epizy.com/5975882069.pdf
    • http://wotadow.rf.gd/37053895490.pdf
    • https://uploads.strikinglycdn.com/files/1118ff9b-a098-4df3-a085-f36b24b49cb7/23734007698.pdf
    • http://gapexer.rf.gd/7725326020.pdf
    • http://rafazusasune.rf.gd/account_balance_sheet_cash.pdf
    • https://s3.amazonaws.com/tevigotu/1540311611.pdf
    • https://s3.amazonaws.com/zuwimadaneb/2941084722.pdf
    • https://s3.amazonaws.com/resisuna/16280407478.pdf
    • https://s3.amazonaws.com/firigugixujotov/miwiwemididumefevov.pdf
    • 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_off0000d9c3.bin
7e68dbaa132dcca44b7c1ea7e2e5d46e783e8ed62700958ae8fc5abe4181211c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 5548 bytes
font_01_sfnt_off0000ec56.bin
c010899de751d664ce47b91aeae9ac3aa4b8beab72ad6b4c03d7be598d012482		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 10780 bytes

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