Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf0b3e01852e0a2…

MALICIOUS

PDF

94.2 KB Created: 2021-05-07 00:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01f42c36e043d0bab65dcac997c16608 SHA-1: d9270b8d8884165570d0f8a391333b06bceb0fc9 SHA-256: cdf0b3e01852e0a24575a48c66a71a977d6fb4e5dc15d002b3578e82bd7b8920
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary URL being `https://jacksth.ru/strik?utm_term=who+can+replace+a+man+what+has+happened+to+the+humans+in+this+story`. ClamAV detection and ML classification strongly indicate malicious intent, specifically classifying it as `Pdf.Phishing.Trojan`. The document's structure and embedded links suggest it's designed to redirect users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=who+can+replace+a+man+what+has+happened+to+the+humans+in+this+story
    • https://cdn-cms.f-static.net/uploads/4469643/normal_6036d779db955.pdf
    • https://xagogijan.weebly.com/uploads/1/3/4/7/134720006/8158722.pdf
    • https://bubixumijek.weebly.com/uploads/1/3/5/3/135397401/pisaruwawefovux-gopusogotudo-pipiwumafe.pdf
    • https://static.s123-cdn-static.com/uploads/4382782/normal_5feb328fa84a9.pdf
    • http://souve.me/spice_and_wolf_light_novel_englishj0tmb.pdf
    • https://cdn-cms.f-static.net/uploads/4406812/normal_604e5bb394143.pdf
    • https://wuwabisa.weebly.com/uploads/1/3/1/6/131606234/f58a902c1.pdf
    • http://lnstagramverifiedbadgeservice.com/80017045548u77nj.pdf
    • https://cdn-cms.f-static.net/uploads/4482847/normal_6060a79bf0659.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/f2279171-683f-433a-aa55-aa0b503a5419/guitar_chords_for_beginners_finger_placement.pdf
    • https://uploads.strikinglycdn.com/files/22a5cb0b-cf63-4883-b0ec-6de37cc2a290/31860813700.pdf
    • https://uploads.strikinglycdn.com/files/64a58302-9daf-4247-9ba2-ba73938917f2/kilew.pdf
    • https://uploads.strikinglycdn.com/files/67702642-b7f0-42a7-af8a-39e514a64eac/requirements_to_get_a_ms_drivers_license.pdf
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_59b6c0d088094e2b8b4cc982dd8c4a30.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0058d16b-b0af-4022-8bd4-e3185848c67a/descriptive_writing_techniques_examples.pdf
    • https://uploads.strikinglycdn.com/files/b1432f4a-fec7-4fbc-bcc5-2b691038d155/what_is_the_army_operations_process.pdf
    • https://uploads.strikinglycdn.com/files/d8bbab71-40ae-4c4f-b7ec-b6e5d53f1bf9/ugc_net_management_books_2020.pdf
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_2311b8b975394f3e9125798106e5b00c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6b9d995b-11c9-4fc0-9081-063ea8176eab/82990440221.pdf
    • https://e2a3f85e-3ce8-4c76-99a2-e63219cad5ad.filesusr.com/ugd/473d25_07eb89da75664b5ba70191041b6da74c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ac70fb0e-5462-4bec-8809-c089d4c34701/samsung_grand_prime_4g_frp_unlock_without_pc.pdf
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_c8f15b7ad15546779ebf7f8c30fdbd52.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122ce.bin
d96ce7050201c30cc60ce761beb5181e3eb875337db01d6cccf8f009e7676bdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122CE 5404 bytes
font_01_sfnt_off0001350d.bin
e4bd94dcad28672fa54d80b0a83800041a4299ee37627f64dba5639e81976375		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1350D 11004 bytes
font_02_sfnt_off00015a84.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A84 4324 bytes

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