Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4e8f220b4fe478…

MALICIOUS

PDF

85.2 KB Created: 2021-05-13 00:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2674423cf6a8b3de8377877eaadc5ae SHA-1: 6a5491bc4c63d5038acaa2e54755cf5aa610e291 SHA-256: 2f4e8f220b4fe478ed6183dfb57054598052ed8235fdfa09986208000f88ba20
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 link farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL points to a domain that appears to be part of a link farm, likely intended to redirect users to malicious content.

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://kuzutuzo.ru/strik?utm_term=rca+portable+dvd+player+for+car+keeps+restarting
    • https://cdn.sqhk.co/vizakifito/hhhiheC/44057046317.pdf
    • https://cdn.sqhk.co/lesepivir/ejjbzjf/73079227813.pdf
    • https://cdn.sqhk.co/zuzudumijamo/JE2iajc/drift_zone_2_mod_apk_unlimited_money.pdf
    • https://cdn.sqhk.co/ribobujir/uXhcf7z/pin_pulling_game_app.pdf
    • http://pokemama.iblogger.org/najijexonalovemepulo.pdf
    • https://cdn.sqhk.co/numorolele/jhi5AtA/ipad_assistive_touch_home_button.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wekidezeze.epizy.com/ccfra_microbiological_methods_manual.pdf
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_6475506e450f47c5a33134f11bf6c2e9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/50320f7b-a9e4-45c0-bca4-cce70b349808/numapejaziguvuvup.pdf
    • https://3491c55f-27e3-40bb-839b-e55f5d2a6f06.filesusr.com/ugd/d14465_6d56ffeb8ffc4a00b4720f47dfafcc89.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5ed1e922-cc75-41f5-a8eb-1f8b49bcda3a/geico_marketing_planner.pdf
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_a2f6425124d74edbb1a6ecf2056f98ce.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a43cf60b-9134-49c4-943b-6d238cc404be/bikezojezenulufope.pdf
    • https://uploads.strikinglycdn.com/files/8b2cb145-842f-4b1e-a4aa-536b5d2e6ab5/2394260598.pdf
    • https://uploads.strikinglycdn.com/files/5475fef0-45d5-4c6b-8c41-ac6d1dbf3339/fizogapa.pdf
    • https://uploads.strikinglycdn.com/files/f9ebe193-b925-4499-9ea8-2c86be75005a/how_to_clean_ge_stackable_washer.pdf
    • https://uploads.strikinglycdn.com/files/80307d45-fb0a-4eda-bee8-37a755355720/what_are_the_10_methods_of_teaching.pdf
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_65526ec744ec4f398a6bd2b12d14de5c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e2186fea-69fc-48a0-a82d-f8d764b38380/dozamiwapiki.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_off00010d82.bin
cc2dbf7f1bc6179dd8bcffaddeb22e67231983b43d23ad406572ad3de39201e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D82 5696 bytes
font_01_sfnt_off00012107.bin
14a8a01c7b0973b4cdd8e76b0998adeeddb8513639cb8df9914d75a177d75f6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12107 11088 bytes

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