Malicious PDF — malware analysis report

Static analysis result for SHA-256 efea2f6b6931b40c…

MALICIOUS

PDF

75.2 KB Created: 2021-04-22 11:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b797aaca2331bcc28be01af0e209c14 SHA-1: d9f5996c6fe21142bda5db6dc41862da28e7f3b1 SHA-256: efea2f6b6931b40c1741bca8bdc64415983ced0e09870cc1c968914534ce74ab
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to link farms designed to generate traffic and potentially host malicious content. The presence of a critical heuristic firing for PDF_SEO_LINK_FARM and ClamAV detection as Pdf.Phishing.Trojan indicates a phishing and malicious intent. The document body, though heavily obfuscated, contains references to search terms, reinforcing the lure tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=harry+potter+mystery+wand+noble+collection
    • https://bazugibeb.weebly.com/uploads/1/3/1/4/131453150/8111518.pdf
    • https://molowusutet.weebly.com/uploads/1/3/1/3/131380828/sowikokidege.pdf
    • https://cdn.sqhk.co/togokitaz/hinmjaj/game_programmer_university_degree.pdf
    • https://govoxarenaja.weebly.com/uploads/1/3/4/8/134874143/e22951892d924.pdf
    • https://cdn.sqhk.co/minofavazu/fJzCibE/5727539423.pdf
    • https://cdn.sqhk.co/dolitife/aa42VKT/the_best_of_beyonce_greatest_hits_full_album.pdf
    • https://cdn.sqhk.co/fapolokid/gcgc3ih/never_have_i_ever_cast_ben_s_father.pdf
    • https://cdn.sqhk.co/tivinarafuvu/c31ihii/rejosited.pdf
    • https://cdn.sqhk.co/nufesewepi/iexilhg/esconi_gem_mineral_and_fossil_show.pdf
    • https://cdn.sqhk.co/jabuvilir/jhiahhu/to-_fu_oh_sushi_2_mod.pdf
    • https://cdn.sqhk.co/dusivubeleza/buDihjb/58247696250.pdf
    • https://cdn.sqhk.co/pasededi/hdhbRyv/mma_manager_apk.pdf
    • https://sasikivi.weebly.com/uploads/1/3/4/4/134462450/1258091.pdf
    • https://cdn.sqhk.co/kopilixa/djfjalo/finubalefitubewadarerane.pdf
    • https://cdn.sqhk.co/rosisole/ohcjhni/76224862865.pdf
    • https://kukibutojiw.weebly.com/uploads/1/3/0/7/130775835/801cfe2f3b1.pdf
    • https://cdn.sqhk.co/fumazuri/fRPji5V/78662457027.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kotodur/wajisezu.pdf
    • https://s3.amazonaws.com/savifin/11518192964.pdf
    • https://s3.amazonaws.com/zuwimadaneb/stihl_ts420_concrete_saw_serial_number_location.pdf
    • https://s3.amazonaws.com/xirixepo/52549304625.pdf
    • https://s3.amazonaws.com/meludav/87849363913.pdf
    • https://s3.amazonaws.com/nutanigonu/3071152237.pdf
    • https://s3.amazonaws.com/wikurixobelu/art_models_7.pdf
    • https://s3.amazonaws.com/gewuwasi/buscar_informacion_traduccion_ingles.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_off0000e8ce.bin
ac835e03197a553703c55ee957367ecd19b9d3ebedcd1c521f16ae9439eed3ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CE 5512 bytes
font_01_sfnt_off0000fb83.bin
ff6892037bf46d32f164ba4f2f5f4d67ff363611dc4becc3d1166685c5a8fcdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 10388 bytes

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