Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f38bc5475de0e6…

MALICIOUS

PDF

73.8 KB Created: 2021-02-20 11:37:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cda274e8de73901a644bc1a5eb16e4b5 SHA-1: ed31c535019f0fde8c66b7cc54019a427716d7c3 SHA-256: 34f38bc5475de0e6c63683787690c3d2facd8972821db8b93fdc981303602f27
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 several pointing to disposable hosting or potentially malicious domains, suggesting a phishing or malware distribution scheme. The presence of external URI links and the 'link farm' heuristic further support this attack pattern.

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 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://jottigo.ru/strik?utm_term=fujitsu+scansnap+ix500+twain+driver PDF link annotation
    • http://xamawodub.22web.org/certificate_chain_incomplete_extra.pdfIn PDF document text
    • https://jasefukop.weebly.com/uploads/1/3/0/7/130776564/5694381.pdfIn PDF document text
    • https://xurebutira.weebly.com/uploads/1/3/2/6/132681359/xajibasofi.pdfIn PDF document text
    • http://gimakelodikovij.iblogger.org/where_are_primo_water_dispensers_made.pdfIn PDF document text
    • https://midamexup.weebly.com/uploads/1/3/5/3/135314938/vunosadelig.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/I6Gjb3q/brain_training_for_dogs_reviews.pdfIn PDF document text
    • http://xevidome.iblogger.org/4735093253.pdfIn PDF document text
    • https://serawododi.weebly.com/uploads/1/3/4/8/134885696/7705721.pdfIn PDF document text
    • https://cdn.sqhk.co/virapazetif/dbzigxN/najabufirep.pdfIn PDF document text
    • https://cdn.sqhk.co/mokavokaven/10ajgjc/free_robux_without_downloading_apps_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vudajerex.rf.gd/beetle_crazy_cup_pc_game_free.pdfIn PDF document text
    • http://rukilokurotog.rf.gd/48999933891.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/13231541799.pdfIn PDF document text
    • http://tuserigetov.rf.gd/nexuvusokewitokuz.pdfIn PDF document text
    • http://lemijafuw.epizy.com/sound_about_apk_latest.pdfIn PDF document text
    • http://betemeparax.rf.gd/97690173859.pdfIn PDF document text
    • http://givaradipokez.epizy.com/88195824974.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_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 5552 bytes
SHA-256: 2d3b3a0319140ce2a31e3b512263c21554ee5c6218b4e968c9133f75353d9445
font_01_sfnt_off0000f6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C5 10392 bytes
SHA-256: 1a5e1d90a8c3060b6afdb875f2895fc4ead4003c73b2ef3bc240206058f92ce5

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