Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ff52b0c0b34b19…

MALICIOUS

PDF

86.9 KB Created: 2021-03-29 21:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 916b47bbbbc010be28352f1d50ee0da5 SHA-1: 21d086dbf319d22f554513f72c1c8c0b1702ff8e SHA-256: 31ff52b0c0b34b1903536a7f804121e19ac5c8e5b9d3c2e9694d28da2edfbbed
96 Risk Score

Malware Insights

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

The PDF document contains an embedded URI that points to a suspicious URL, likely intended to redirect the user to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to motocross gear.

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://ponafet.ru/strik?utm_term=what+gear+do+i+need+for+motocross
    • http://shop-profildoors.ru/97497421595nqyg3.pdf
    • https://cdn-cms.f-static.net/uploads/4394060/normal_6046201583da2.pdf
    • https://cdn-cms.f-static.net/uploads/4418783/normal_605cd3d8c906b.pdf
    • https://cdn-cms.f-static.net/uploads/4504922/normal_603ce5f7c5708.pdf
    • https://cdn.sqhk.co/torazanopuni/cuFhahc/spades_offline_free_card_games.pdf
    • http://carbackseat.site/sorokivini0fgy2.pdf
    • http://rugegav.mywebcommunity.org/mercedes_benz_e_class_2020_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4370054/normal_6032133b01020.pdf
    • http://sacredname.ru/asphalt_8_cheat_engine51lnc.pdf
    • https://static.s123-cdn-static.com/uploads/4376602/normal_5fecc36671e1f.pdf
    • https://cdn.sqhk.co/jalafimimodo/bidIIhj/43363582258.pdf
    • https://cdn.sqhk.co/volixusej/jfjgp6g/69149759461.pdf
    • https://static.s123-cdn-static.com/uploads/4416302/normal_5fc994f6b497d.pdf
    • http://jakusavu.sportsontheweb.net/schindler_s_list_sheet_music_piano.pdf
    • https://cdn-cms.f-static.net/uploads/4466368/normal_6051fc2d61dad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e55a7f5c-895d-463a-8c55-0e98abd64351/data_structures_and_algorithms_in_java_2nd_edition_by_robert_lafore.pdf
    • https://uploads.strikinglycdn.com/files/89e97700-1aa2-40c7-83ad-6a661a6bcede/lulibara.pdf
    • https://uploads.strikinglycdn.com/files/e1b74c3b-f793-4009-ab12-42f59a7adb75/el_mundo_de_sofia_sinopsis.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_off0001180b.bin
af3acedbbe6692dfaa4440a5b5faf2cf4812caca324fbeaeab032f4cad6019b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1180B 5416 bytes
font_01_sfnt_off00012a5f.bin
f017b20dcd5bb3c6740f158495ca77766feee3192774b511e0def34e77fa08e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5F 10740 bytes