Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4d1d0e08fcd641…

MALICIOUS

PDF

74.8 KB Created: 2021-04-17 22:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b31bb8ad4ba1c8c3e1a1addf6aed3f6 SHA-1: d3d243d3b987790b41db4169db5c0cbb01ab497c SHA-256: ba4d1d0e08fcd641b93e693f3fd646e0a1556b123552876f4387a2bea947fed9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominently featuring a 'Call of Duty update' lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=call+of+duty+update+size+ps4
    • https://cdn.sqhk.co/jadidawa/jfjgihu/menschen_a1._2_arbeitsbuch_answer.pdf
    • http://sibidadaduzej.iblogger.org/canada_work_permit_application_form_download.pdf
    • https://xidumalebuwun.weebly.com/uploads/1/3/4/8/134894794/fupenur.pdf
    • https://cdn.sqhk.co/tobijoge/hiS7hf5/mifixeneridamuxozo.pdf
    • https://cdn.sqhk.co/bofagenined/jjgeiaT/63891625857.pdf
    • https://cdn.sqhk.co/xivovido/LhFQHig/nihilumbra_walkthrough_city.pdf
    • https://negamevetafe.weebly.com/uploads/1/3/4/4/134439480/9804603.pdf
    • https://vigoxanumevu.weebly.com/uploads/1/3/4/4/134466257/tapareke_rutuk.pdf
    • https://cdn.sqhk.co/lubigegek/wghieFi/garageband_like_app_for_pc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/680944b4-8337-4fda-bf14-ffe38d6c6e5c/27332136075.pdf
    • https://s3.amazonaws.com/polojuliragam/rise_up_singing_lyrics_daisy_may.pdf
    • http://tuwafuvokix.rf.gd/parentheses_brackets_and_braces_math_worksheets.pdf
    • https://s3.amazonaws.com/betefowubevat/pibirapawipakimovuboregu.pdf
    • https://s3.amazonaws.com/pobixedele/65502305360.pdf
    • https://uploads.strikinglycdn.com/files/947b8113-96b9-4970-b5ae-6549b6d9a4ba/summer_music_and_movement_activities_for_toddlers.pdf
    • http://boponewutizubi.rf.gd/penguin_books_download.pdf
    • http://wixezujixib.epizy.com/aap_exchange_transfusion_guidelines.pdf
    • http://mevodazef.epizy.com/50447447189.pdf
    • https://uploads.strikinglycdn.com/files/1c76611a-1f90-47ce-b8cb-f15622606262/60571774184.pdf
    • https://uploads.strikinglycdn.com/files/3533b258-d770-4c5d-9f64-55c1fb08609b/skill_vs_no_skills.pdf
    • https://s3.amazonaws.com/minabiwa/pilijajovobudanojugu.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_off0000e403.bin
97349ceb0115b062888a01f544c66f8ed6dcd0d416ccdb82a9e5c085b2e0a156		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE403 5084 bytes
font_01_sfnt_off0000f57f.bin
2b02757311bafb93e268067d4af2af20686f655f989f1829510eea51a3fe7a13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 11508 bytes

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