Malicious PDF — malware analysis report

Static analysis result for SHA-256 259b129aa39ad55c…

MALICIOUS

PDF

73.3 KB Created: 2021-03-30 06:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 669ec3308090977992239c5cc16f10a5 SHA-1: a958f844cd0fa346caaeb55a5552e3f7be12bda9 SHA-256: 259b129aa39ad55c0470b286fd9659f9d88b5396ca0312cc337d265584f69333
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution.

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://midufefew.ru/wix?keyword=similar+figures+and+scale+factor+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4457876/normal_5fec485f228a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421460/normal_5fe64404d43c1.pdfIn PDF document text
    • https://cdn.sqhk.co/ximegawaso/hbKs8vd/gomuwurewux.pdfIn PDF document text
    • https://cdn.sqhk.co/toviranevu/hgjiigg/12275646410.pdfIn PDF document text
    • http://lifokuvaxodime.iblogger.org/how_to_use_instant_pot_pressure_cooker_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/xewiliwilax/jdkgiDu/infective_endocarditis_criteria_ppt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475987/normal_5fce3678d95b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458616/normal_603fba92e7549.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/hdidugG/sad_flute_ringtone_2020_download_pagalworld.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/bidemewufa/no_brainer_song_pagalworld.pdfIn PDF document text
    • http://favekagopu.epizy.com/17969154703.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_6c1e6182108e4363a7e6734af1bf67bd.pdf?index=trueIn PDF document text
    • http://jariluwalube.epizy.com/zimogijetelogetile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f22c25c6-f4d5-4d39-8d2c-fbb3dd91156f/honeywell_lynx_plus_installation_manual.pdfIn PDF document text
    • http://kudekati.epizy.com/personality_adjectives_worksheet_esl.pdfIn PDF document text
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_bd6ef53509e24d6c8e236014ba88206b.pdf?index=trueIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_c0e499c7ad07498bb3c34d7fea924ec0.pdf?index=trueIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_9242b7b5cf3141cbbac17855af3176f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/bodakagorumaruzowupezomo.pdfIn PDF document text
    • http://ribugozetuxofo.rf.gd/basobizobuvurit.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/formal_business_greetings_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd3160b6-4aca-4fcc-a238-0f9bf3211fcc/big_little_lies_season_2_episode_8_recap.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_e41c8673a5704f649540c22048e77d61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutisigila/pixav.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/52964272883.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_off0000dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 5696 bytes
SHA-256: 5cf9c2b3ad3dd14fa1ee8f914a13bdbb4e1c98330aeb11c450d613c6348b222d
font_01_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 10756 bytes
SHA-256: 972598f6d44b9940ed5c6d4d43d6ec504211884d0004d8f6129d6899b2cf0111