Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f60a0d5e4be5a93…

MALICIOUS

PDF

69.5 KB Created: 2021-04-29 09:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4a579429cec3f2aa46d60e29313d56f SHA-1: 640235c4e5160e94e592e5bfe0f4adda7234e62c SHA-256: 5f60a0d5e4be5a93927c8296e9cf42cf9700227e9c1015ce1e04aef18c487e27
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, likely intended to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://zajinet.ru/strik?utm_term=keith+pilbeam+international+finance+pdf+download
    • https://cdn.sqhk.co/turaxulefa/Hw3hjz9/genetic_disorders_list.pdf
    • https://cdn-cms.f-static.net/uploads/4381541/normal_5fd31d9107499.pdf
    • https://cdn-cms.f-static.net/uploads/4390097/normal_605821716b5ac.pdf
    • https://cdn.sqhk.co/kigimole/7WGLhhA/the_game_of_life_junior_rules.pdf
    • https://cdn-cms.f-static.net/uploads/4455901/normal_606a4a1f38a16.pdf
    • https://cdn-cms.f-static.net/uploads/4456699/normal_6021c50c01db6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/834bc139-78f8-4bb1-a43e-adfbb82df9a3/zidatume.pdf
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_3d7a36f636494d19b9293eb89678dc7b.pdf?index=true
    • https://s3.amazonaws.com/fulosobezur/39075975510.pdf
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_bf3e44f4191045e9a701395614580857.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ee214410-1752-4948-90f6-bc680daa0de0/best_openings_for_chess_beginners.pdf
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_1fb72add18b445c287b8e0abde22737d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3f6f6fb4-03dd-4598-b830-213385d89a27/bissell_turboclean_powerbrush_pet_not_spraying.pdf
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_6c9e1424f34d410a9095167555d9b544.pdf?index=true
    • https://s3.amazonaws.com/paxunu/cifra_club_tuner.pdf
    • https://s3.amazonaws.com/firigugixujotov/3083467140.pdf
    • https://uploads.strikinglycdn.com/files/77ddd782-1194-4e85-8f6a-bd77af8cb65b/tamil_font_design_online_free.pdf
    • https://s3.amazonaws.com/dekogamik/calendario_2020_argentina.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_off0000d292.bin
a23820198bee7b3ef709a4c7cb530714d9e0699b1b17ae9df6e8511d1f60048e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD292 5416 bytes
font_01_sfnt_off0000e4e6.bin
4144cb7d915ce8acea0ed177c8535a4ec2662069803aece11067e81bec8420b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E6 10592 bytes