Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fc396bbe935312…

MALICIOUS

PDF

99.7 KB Created: 2021-01-27 20:58:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f542187781888e9f3f5eff6c78db95ec SHA-1: 84b5beebf5bb3458aa64244f1dbc4fa18e54b6e3 SHA-256: 91fc396bbe93531224cbe1752f906a7e5a73eca970d3ba05419a82fa3c6b0b60
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with heuristics identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=wand+of+polymorph+3.5 PDF link annotation
    • http://hookup157.fun/singing_in_the_rain_lyrics_englishh6ytj.pdfIn PDF document text
    • http://fodamibokaf.66ghz.com/toronto_tv_guide_schedule.pdfIn PDF document text
    • http://show-visitor.xyz/37083196232348q8.pdfIn PDF document text
    • http://dwatches.site/zuzuzurewitevozofiw21vs.pdfIn PDF document text
    • https://cdn.sqhk.co/pesegozod/jgkUhdv/54058215982.pdfIn PDF document text
    • http://komarovskii.xyz/four_quartetsyw5ao.pdfIn PDF document text
    • http://digitalmedialit.com/story_maker_for_instagram_story_starterspuryw.pdfIn PDF document text
    • http://bilabugova.iblogger.org/connecticut_river_academy_uniform.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/chopMHw/helicopter_crash_chernobyl_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/porodiwaten/ZfqBcji/game_apk_mod_android.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/varolexexus/js_interview_questions_and_answers.pdfIn PDF document text
    • http://zinezalidoratov.rf.gd/canadian_thoracic_society_asthma_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/corporate_social_responsibility_policy_template_uk.pdfIn PDF document text
    • http://sogisujomixugo.epizy.com/1617757716.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/xizenalarebokefiram.pdfIn PDF document text
    • http://refuzopil.epizy.com/bade_ghar_ki_beti_film.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_off00014b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B08 5540 bytes
SHA-256: d55d547189ef266d9572c403adc3c22b600fa03b4b2142601aaecd5974e5ba55
font_01_sfnt_off00015dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD1 10588 bytes
SHA-256: 08b6fa1cb5d7acb3cb727afb3e2de38fa157500186a4d1bd5a596b488ed55fd8

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