Malicious PDF — malware analysis report

Static analysis result for SHA-256 4147af5dadf8727d…

MALICIOUS

PDF

86.8 KB Created: 2021-03-04 18:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ab5b67178b3b089fa96266066e9b8503 SHA-1: 401136391c4ee374d36dd8afcb716e1c75c10450 SHA-256: 4147af5dadf8727d1fb5944cac86203bb9e1e35ce1ad65368f92f0a0fa49d7de
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and employing UTM parameters, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports a malicious intent to redirect users. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://maypoin.ru/strik?utm_term=how+to+get+fl+studio+cheap PDF link annotation
    • https://cdn.sqhk.co/ligumorik/giIQhaB/dynamons_2_by_kizi_mod_money.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481397/normal_601b8debc0b0d.pdfIn PDF document text
    • https://cdn.sqhk.co/kenoramof/iaBhfie/kuxemixatonimomixese.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/xMhaihX/download_mod_fireball_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/guzelatolina/nAjjgdl/xijitabunilufis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391001/normal_6019947ab34e5.pdfIn PDF document text
    • https://cdn.sqhk.co/pulununese/jiIIjfU/tubing_in_helen_ga_july_25.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/jggdrhj/arena_gymnastics_at_gymland.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528915/normal_6013457359da9.pdfIn PDF document text
    • https://cdn.sqhk.co/zidezofa/hchcgcE/nozamezeterefopibajovak.pdfIn PDF document text
    • https://cdn.sqhk.co/tisumusef/dew8gdG/sepob.pdfIn PDF document text
    • https://cdn.sqhk.co/nozalodugavi/ibzzsns/fast_lap_indoor_kart_racing_las_vegas_nv.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwolupenilu/jfhgLjd/five_ten_freerider_pro_tld_mountain_bike_shoes.pdfIn PDF document text
    • http://jofifuneku.medianewsonline.com/43973301281.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/Bigfghf/bug_s_life_ant_kim_kardashian.pdfIn PDF document text
    • https://cdn.sqhk.co/retesixabe/ijjffhe/oddmar_android_apk_obb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sujevulakaginig.rf.gd/15684470156.pdfIn PDF document text
    • http://dinixebun.epizy.com/les_sept_nouvelles_merveilles_du_monde.pdfIn PDF document text
    • http://kevawiposiwa.rf.gd/salawikain_at_sawikain_worksheets.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/3026483309.pdfIn PDF document text
    • http://kaderuzaxaje.rf.gd/maytag_bravos_washing_machine_and_dryer.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_off00010b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 5376 bytes
SHA-256: 9cdf74e9a59a89d77222b5050aeeeacd5af8d363923f1c8060207e5511c37b2a
font_01_sfnt_off00011d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D63 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off000125f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F1 11652 bytes
SHA-256: 2bd444cf10767b1f6925b0d7b446ee0ae660f94ef3e31b129ccef6a5d60421ff

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