Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41558acd12b352f…

MALICIOUS

PDF

74.2 KB Created: 2020-12-27 10:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caee1daf7d1921a64e008486d5ec0a33 SHA-1: 1e9cb69f91bb91f6a20abc2e16076f4056b93527 SHA-256: f41558acd12b352fc75139bfc4f4312959e8d37f31131f715016e1d225c0bd28
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 other PDF files, suggesting a link farm designed to attract search engine traffic. One of the primary external links, 'https://traffset.ru/strik?utm_term=soccer+battle+royale+download+pc', indicates a lure related to game downloads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

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://traffset.ru/strik?utm_term=soccer+battle+royale+download+pc
    • https://cdn.sqhk.co/wozepefiga/0YxPjeQ/lineage_2_revolution_best_class.pdf
    • https://cdn.sqhk.co/diwomijo/jfJcjZ2/epic_battle_simulator_2_level_30.pdf
    • https://cdn.sqhk.co/zotevokep/fii8phj/pixel_swordfish_io_youtube.pdf
    • https://cdn.sqhk.co/gemadaruvow/jcTghps/pocketmine_plugins_list.pdf
    • https://cdn.sqhk.co/fuluzezufe/gd46jfq/water_slide_decal_paper.pdf
    • https://cdn.sqhk.co/zenetofuma/X0Mham6/fasimijutaripe.pdf
    • https://cdn-cms.f-static.net/uploads/4420013/normal_5f99bca97b41b.pdf
    • https://static.s123-cdn-static.com/uploads/4366655/normal_5fd09a89ac8a7.pdf
    • https://cdn.sqhk.co/muvetowiripa/13ja8id/mystic_messenger_jumin_bad_ending_day_8.pdf
    • https://cdn-cms.f-static.net/uploads/4449603/normal_5fb3730f8c086.pdf
    • https://dopikilazobowu.weebly.com/uploads/1/3/4/4/134488506/fugev.pdf
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f8a98697914f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zebarufuridorur/nowuretabe.pdf
    • https://s3.amazonaws.com/tezofuretejom/94372995024.pdf
    • https://s3.amazonaws.com/felasorarabipis/43202879988.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcea.bin
3669838b6830f0d60717709ee73c5e989e2c178d6b52b7865004c05f1286b55d
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 5324 bytes
font_01_sfnt_off0000ef22.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 1800 bytes
font_02_sfnt_off0000f7af.bin
0b743772df6bcd431686e8f6f61e3e5b1dc6e1fffe9373b1d09be81064501452
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 10476 bytes