Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e8f7d46b5a1060…

MALICIOUS

PDF

64.3 KB Created: 2020-12-24 06:40:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a82447d42a005638b48f97b88750434 SHA-1: 2a5baa8f63912727808f68396b8e7f4098c0c007 SHA-256: f3e8f7d46b5a1060aa211d8be7ea19fb977c1b15b3357c80f5c6f23c250a3531
104 Risk Score

Malware Insights

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

The file is a PDF that contains an external URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be related to search terms, further supporting a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/aws?utm_term=11th+biology+important+questions++pdf
    • https://static.s123-cdn-static.com/uploads/4421639/normal_5fc8a055bcfb5.pdf
    • https://cdn.sqhk.co/bujavenizake/jjhdheE/togizenitixaxutoxaxas.pdf
    • https://cdn.sqhk.co/mewidexe/RWD16qm/game_maker_s_toolkit_mark_brown.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zedudo/stanley_coffee_mug_warranty.pdf
    • https://s3.amazonaws.com/ginutu/64387150997.pdf
    • https://s3.amazonaws.com/nakevoja/south_movie_video_free.pdf
    • https://s3.amazonaws.com/ribowexulo/gill_manjot_surgical_pa_fort_worth_texas.pdf
    • https://s3.amazonaws.com/jefazaxal/alesis_sr-_16_drum_machine_manual.pdf
    • https://s3.amazonaws.com/jixerubowi/punnett_square_worksheet_lab.pdf
    • https://s3.amazonaws.com/pezofut/kathi_movie_aathi_song_ringtone.pdf
    • https://s3.amazonaws.com/ladiwuzetawedi/xaziburugovuxilerizakowem.pdf
    • https://uploads.strikinglycdn.com/files/80ab0711-987f-43b7-b74b-d274cf9bb3a0/latexuwigusamif.pdf
    • https://s3.amazonaws.com/votuweroxigezog/adjectives_starting_with_g_to_describe_food.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_off0000bfb6.bin
d37d5b06fe3ec5f11916480505d43cc3e6e1da2d712eb3a8d43d8a82b5412f35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB6 5780 bytes
font_01_sfnt_off0000d32d.bin
8447387637bbcf8ea2f3bad3fd69b0384bae8fa9f87c0b247977f4158e915e87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD32D 9792 bytes

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