Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9baccafc15a508…

MALICIOUS

PDF

69.4 KB Created: 2021-04-07 14:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4549af4d96071a27f4184ebcba3c0c36 SHA-1: 164f2c0f5a3b6b927042e07dfb3cbe073934f290 SHA-256: 0a9baccafc15a508922572d9a5245fceb393622c0b553a74bad8f052a6c13d18
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 link farm SEO abuse and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious sites, likely for credential harvesting or further payload delivery.

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-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://kuzutuzo.ru/wix?keyword=sierra+reloading+manual+online
    • https://cdn.sqhk.co/nijedesakuj/daaz4hh/nolidatifizidalun.pdf
    • https://cdn.sqhk.co/vegedusovo/kJgdhf9/police_officer_killed_in_east_st_louis.pdf
    • https://cdn.sqhk.co/salasereki/kijgkNn/star_wars_racing_game_n64.pdf
    • https://cdn.sqhk.co/vijukifezu/hhbiege/old_version_of_kika_emoji_keyboard_pro.pdf
    • https://wetuwisiw.weebly.com/uploads/1/3/4/4/134495793/fifeseg.pdf
    • https://sagejajake.weebly.com/uploads/1/3/5/3/135303377/bipuxaju-tebap-dokaxebatevivin.pdf
    • https://cdn.sqhk.co/limiwebu/jKgghjX/pubalutop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jefobexapulow/71929373828.pdf
    • https://a6668164-4238-4e0d-addb-cc4c62f58fca.filesusr.com/ugd/2dfcca_a0c17836f6be4d96b4944321c157cd62.pdf?index=true
    • https://e1c07d4e-6587-4767-b76f-5dea9cf3e327.filesusr.com/ugd/51a829_6609c27281614c8bab6e29ad51a0adcb.pdf?index=true
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_e2fb3b988eee4619a060a69bf43cb19e.pdf?index=true
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_8abe78a6035e4c49acb15c2fc315ccb2.pdf?index=true
    • https://s3.amazonaws.com/wurivuve/best_action_rpg_android_reddit.pdf
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_fd5f14d5e47840929f04b324ad686ff5.pdf?index=true
    • https://s3.amazonaws.com/tazopaju/grams_to_kilograms_worksheet.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_off0000d29b.bin
b8dfb89297ff70883411cd434a83f2cbf591ea49d96013605664a70cb89596dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD29B 5072 bytes
font_01_sfnt_off0000e3bc.bin
ed31c275a5ab637a76f43f558f726e7157930ef0af32a0b7927a4cb60fc45441		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 10884 bytes

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