Malicious PDF — malware analysis report

Static analysis result for SHA-256 998e8332202ba72d…

MALICIOUS

PDF

77.2 KB Created: 2021-04-02 12:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d5b90eb61bea5fdbd5d9f6b201b252b SHA-1: e22d6b88bf0346968911a29e7b9bdd5301943ac8 SHA-256: 998e8332202ba72df3d77c45e42b652f7778304be245327845ea6289bd2b1543
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam and phishing. The primary malicious URL, 'https://dafemum.ru/wix?keyword=gupta+empire+medicine+facts', suggests a phishing attempt disguised as a search result. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/wix?keyword=gupta+empire+medicine+facts
    • https://zuzotupewumu.weebly.com/uploads/1/3/4/6/134691050/22df839bdcc.pdf
    • http://kolagozisil.mywebcommunity.org/70387821919.pdf
    • http://nanamojuvimujo.medianewsonline.com/importance_of_work_life_balance_in_the_workplace.pdf
    • http://lenugaguv.medianewsonline.com/bsc_nursing_merit_list_2020_download.pdf
    • https://gajevorotaro.weebly.com/uploads/1/3/5/3/135329880/woramasirowuxok_mamosabi.pdf
    • https://xusikezawijuxop.weebly.com/uploads/1/3/1/4/131407227/xanov-zidetaf-voder-tifegujojura.pdf
    • http://liwurivosopap.medianewsonline.com/go_math_online_textbook_grade_5.pdf
    • http://meserowogawak.iblogger.org/playstation_3_cech-_2001a_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/75e85172-9002-4b35-a39f-5073574fdec7/telesin_gopro_backpack_strap_mount.pdf
    • https://uploads.strikinglycdn.com/files/a2139e79-b53d-41d6-9b44-0cb76e7af060/93905715756.pdf
    • https://uploads.strikinglycdn.com/files/9aca2336-a4eb-41a6-9b9d-583770fa22c0/waiting_for_the_barbarians_book_synopsis.pdf
    • https://uploads.strikinglycdn.com/files/4bbfc7f7-a46b-4c90-89cd-2b27a0ebd6b2/52192957645.pdf
    • http://pivunovukemo.epizy.com/dusodijosevujodi.pdf
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_322a27358e5348e59eb48f01eb0afd76.pdf?index=true
    • http://dozuxix.myartsonline.com/51288949872.pdf
    • https://uploads.strikinglycdn.com/files/8307b053-1899-422a-88c8-aec7818f71be/rccg_sunday_school_nov_22_2020.pdf
    • https://uploads.strikinglycdn.com/files/43ec531e-3bcc-4c0c-8df7-03c3c6f604fc/football_training_exercises_for_5_year_olds.pdf
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_a24f14ce62fc408cb49d4635d26780e3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d6cad89b-c111-4da8-878f-7933373a0764/xfinity_technicolor_tc8305c_not_online.pdf
    • http://lajirino.rf.gd/14459445775.pdf
    • https://uploads.strikinglycdn.com/files/de73fcfe-5aa5-476c-872c-eeb081d2894f/is_narnia_4_coming_out.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_off0000efc2.bin
0ba02d9c2c18d86270103b780ebcac1266a5505781128839ab4df2568c61cc9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 5300 bytes
font_01_sfnt_off000101b9.bin
7ffae429583a5f299f3d7a94bcde5eae8cb0a34b2446653094c0eeeff9b2a3ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 10448 bytes

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