Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea21c1ec61a3b73…

MALICIOUS

PDF

65.5 KB Created: 2021-03-27 16:31:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b0babbb9230b7e2e0d21408f812e8e40 SHA-1: 536bc1590dadf4e53715643398e7f2546db450ce SHA-256: aea21c1ec61a3b73bae88ccd18a4f7833d351d76b32c0c52139fc648ab4ceae4
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'ponafet.ru', which is flagged as an external URI. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is part of a link farm designed to host many links on disposable domains, further supporting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content.

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://ponafet.ru/wix?keyword=biozone+biology+for+ngss+answers+pdf PDF link annotation
    • http://bcpzonasegura10beta-viabcp.com/tokyo_ghoul_season_2_episode_2t6yd8.pdfIn PDF document text
    • http://reduslimitaly-official.website/toca_life_neighbourhood_secretsxggfq.pdfIn PDF document text
    • http://fegiroxopirez.sportsontheweb.net/72760727575.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/6774583358069ri7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_b5caf6ba576a46e6840c00cca989e1a7.pdf?index=trueIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_a6fe939bde4a4e95af10991bf3a692a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/didawu.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/oracle_session_default_date_format.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/majesty_here_i_am_lyrics.pdfIn PDF document text
    • http://naxesabefadufu.atwebpages.com/ccna_lab_tutorial.pdfIn PDF document text
    • http://susabumo.atwebpages.com/98395102086.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_312205f9395848fd87982f9d0be14368.pdf?index=trueIn PDF document text
    • http://judejelalub.rf.gd/xsplit_1._3_full_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/laginekux/nolotijuvalid.pdfIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_261662d0446640758213227885c70ee8.pdf?index=trueIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_df7203af00bc4687af44b119eedd3c72.pdf?index=trueIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_2d9a2594ac734b0f9af54b4cadaaa1f2.pdf?index=trueIn PDF document text
    • http://pomigipasa.epizy.com/comedones_treatment_guidelines.pdfIn PDF document text
    • http://zogivoti.epizy.com/gineselukoporijuwevejekus.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_bdc72c883b6b4ee39eb9c43ad4611d9f.pdf?index=trueIn 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_off0000c1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DE 5644 bytes
SHA-256: 0b835414d078e9509dc8ef308bae62f2096e92325b77fa2612bc100b4008204e
font_01_sfnt_off0000d547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD547 10396 bytes
SHA-256: 751faa3b8e9386c262f4d71f71aecb1171a6d085213073ebba2d1f398426cb42

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