Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab07c60fb0d631c…

MALICIOUS

PDF

81.7 KB Created: 2021-05-16 18:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89965398d5783c037dbf5e3d0277e730 SHA-1: 82816f0bed4da8266f1776f1a0329fb60f098d56 SHA-256: cab07c60fb0d631c86a7fab00a110df7e3acf1fa9125a1d738611899195c309b
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, many of which point to unknown or potentially malicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=the+things+they+carried+essay+questions
    • http://genusadnlo.space/how_to_play_the_original_rummikub_gamen3y0c.pdf
    • http://study-english-02.space/74143534177ac94.pdf
    • http://feyakast.online/94321922866tm5ig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e995a9cd-6d9b-4233-9372-865a202c385f/how_do_you_test_for_macromolecules_in_food.pdf
    • https://uploads.strikinglycdn.com/files/3a7ed87a-af60-4d31-8834-2f13935a59d3/gawovomolunumukogipemes.pdf
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_3d14a0f32a61498494f3dbdfff71f239.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bf5bf17b-da61-4024-9104-1ce415af020b/tuduwudemaladef.pdf
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_c7384e64828f405c8bdf1e44b84f8f02.pdf?index=true
    • https://s3.amazonaws.com/kiremefegonar/7508244537.pdf
    • https://s3.amazonaws.com/likadojivivofu/45286892136.pdf
    • https://d934ed86-632c-4751-b35b-4303166f997e.filesusr.com/ugd/be0f55_4958a317ec524737a25c46f69684342e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/747edf1c-4779-4002-8745-10ea5a9fe836/how_charlie_and_the_chocolate_factory_book.pdf
    • https://s3.amazonaws.com/gogoxowiniza/etica_para_amador_capitulo_1_resumen.pdf
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_37c53d50cb214a0c87386238ba171a6a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ed598a58-525b-46d9-a0f2-08855d244206/zewiworisazu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102ed.bin
e13454efed10a7c4d23173a2e6f7fb0744ff0ac3756b714063d74872f7ad5bae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102ED 5344 bytes
font_01_sfnt_off0001151a.bin
304191eb7c7d5902c96a3e2fe0ae654afb3206192843caa47ea0a9fc03aa024a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1151A 10952 bytes

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