Malicious PDF — malware analysis report

Static analysis result for SHA-256 16147f4b9aba7160…

MALICIOUS

PDF

88.1 KB Created: 2021-04-23 15:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 82fcd5bf2f5f54c6254823dd308dbd0b SHA-1: 2134be2afc534cb0debc4b812262855621dec8f7 SHA-256: 16147f4b9aba71605b5703b9751443d063b88e06856384b7370d1f57f2c55cbf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are associated with link farming heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains a URL that mirrors the search query, suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/strik?utm_term=haruki+murakami+best+books+in+order PDF link annotation
    • http://xafopawiki.medianewsonline.com/elements_of_a_film_review.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/the_book_thief_summary_pages_1-80.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/nimomig.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/ih6RBie/puzzly_puzzle_game_collection_mod_apk.pdfIn PDF document text
    • http://zetumitufam.mywebcommunity.org/antisocial_personality_disorder_treatment.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/iejihcA/ding_dong_song_lyrics_f2.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/dYifJhc/pandemic_ebt_texas_2nd_round.pdfIn PDF document text
    • http://newutatokulu.getenjoyment.net/tepevelipex.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/h8haicd/first_interstate_bank_personal_mobile_banking_app.pdfIn PDF document text
    • https://cdn.sqhk.co/xogedusov/3IjikyZ/texeguxubivajuzominebezi.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/10873409599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_5fdc87038ae08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463554/normal_6013a5a6a95b1.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/zalisujezajaje/biography_template_for_students.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/docker_commands_tutorialspoint.pdfIn PDF document text
    • http://posazexemonepen.rf.gd/azurine_uhc_texture_pack.pdfIn PDF document text
    • http://diwiludoki.rf.gd/jupigurud.pdfIn PDF document text
    • http://jijetebum.epizy.com/le_bescherelle_gratuit.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/72572095808.pdfIn PDF document text
    • http://bitenozof.atwebpages.com/98061050873.pdfIn PDF document text
    • http://wugetad.myartsonline.com/operating_system_concepts_9th_edition_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/55132688276.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 5104 bytes
SHA-256: e917c35add78dcc95dd082a9f48d434d1c91fcf0ea41db80f0a6cc3518b297a4
font_01_sfnt_off00012263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 1956 bytes
SHA-256: 1a02017d8f9dfccebdf658a6e57aaf3f1db45e167806d7a7e54ac7b5b333925c
font_02_sfnt_off00012b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B86 10804 bytes
SHA-256: a871825961dc905d51770de4a5fc7924652a64718aff4ffea93851b9fb7c8c94

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