Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3fa1c8c6f4a2a1…

MALICIOUS

PDF

77.2 KB Created: 2021-02-14 14:07:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f3a0c45cb294382394b296f07c7ab790 SHA-1: 33bbcc6d9d6a6717a5c5c532408c7df47b6ecc4f SHA-256: ef3fa1c8c6f4a2a193b236bd94d186e177d49a8504edf6d29fd4f34f830e1219
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The 'PDF_SEO_LINK_FARM' heuristic specifically points to the creation of numerous external links, with 'https://jottigo.ru/wix?keyword=comprador+de+carros+chocados' being a prominent example. This suggests the document's primary purpose is to redirect users to potentially malicious or scam-related websites, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://jottigo.ru/wix?keyword=comprador+de+carros+chocados PDF link annotation
    • https://cdn.sqhk.co/lokiwejawe/iapImhi/xuvijuvasol.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/jf4gjBw/spiral_notebook_with_clear_pockets.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/icJg3na/monster_trucks_movie_stream_online.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/h5mVifq/47704457433.pdfIn PDF document text
    • https://cdn.sqhk.co/mimufedu/gfiWgiL/texozepos.pdfIn PDF document text
    • https://zojopufowe.weebly.com/uploads/1/3/4/5/134523349/lafufovigumozofa.pdfIn PDF document text
    • https://zaxixeresez.weebly.com/uploads/1/3/1/8/131871416/633010.pdfIn PDF document text
    • https://cdn.sqhk.co/taxeseta/jcvjbhc/5336999558.pdfIn PDF document text
    • https://binamakizixevuj.weebly.com/uploads/1/3/2/8/132814618/1334579.pdfIn PDF document text
    • https://cdn.sqhk.co/webepinovet/T12nOhj/folivuresepuzarazufegivum.pdfIn PDF document text
    • https://cdn.sqhk.co/bujiwamovul/jcCjdih/bluetooth_speaker_waterproof.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/vuforewebub/bitlocker_for_windows_10_single_language.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/have_got_test_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/vcl60._bpl_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/garegide.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/fodomeguzobatowivapekema.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/androidx_customtabs_gradle.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/21229856747.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/motevowem.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/52692274606.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/13498619803.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/nepugukotemof.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/kgf_audio_songs_free_in_tamil.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_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 5184 bytes
SHA-256: 8ae6dee88fe431a8f705f1937b45178377b0adccbe45f9d8ecc81bd7d790e6b1
font_01_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 11556 bytes
SHA-256: 8f0ce8b4708e3c6437dd0706cd473644c350b2e80e042c4472253d1507836015

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