Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb40b7870c6f62fb…

MALICIOUS

PDF

70.7 KB Created: 2021-03-07 04:39:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a019ad6d7dcc217d5396e737df63bf8d SHA-1: 2b5fe970c81a16b97610e132cc1c7b3e75d1af77 SHA-256: cb40b7870c6f62fbc33675882e6d7feb0d75dde90bed86eebcb811864d99f4aa
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 'golowaki.ru', which is likely part of a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest an attempt to redirect the user to a malicious external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/wix?keyword=leche+flan+ice+cream+cake
    • http://balegetiwep.mywebcommunity.org/44204208770.pdf
    • http://prodson.fun/what_is_wsj_prime_rate_todaymql3i.pdf
    • http://kukushka.space/blank_climate_graph_worksheetsmjc4.pdf
    • http://probkin34.xyz/ultimate_galactic_conquest_modkglwy.pdf
    • http://dfwshootersupply.com/bass_pro_shops_duck_shooting_target_gameoe754.pdf
    • http://jolixasij.sportsontheweb.net/susolukajalurixavimubusi.pdf
    • http://nukapag.getenjoyment.net/bofezagiguxefi.pdf
    • http://bitalotava.scienceontheweb.net/pretty_little_liars_season_6_episode_1_free_online.pdf
    • http://reggis.info/dd_campaigns_5el90q3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/putelekireza/73396081113.pdf
    • https://s3.amazonaws.com/dexodekelaseki/aranya_kandam_tamil_movie.pdf
    • http://jezevenakos.myartsonline.com/73206319224.pdf
    • http://dapizodipe.myartsonline.com/what_is_the_best_book_for_gre_prep.pdf
    • https://s3.amazonaws.com/fajeloninesitel/1224549917.pdf
    • https://s3.amazonaws.com/jenagubadopi/95763544038.pdf
    • https://s3.amazonaws.com/xufaxoferugod/84819058649.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_off0000da51.bin
c39bf06c1470f8a277710211c4fd21966f97a24080526ac58ef7a0420cd89a50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 4948 bytes
font_01_sfnt_off0000eb05.bin
66c88cad3f7420ff616d20c192706ba2e9884643e9ac50e6892169f3f2511508		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 10196 bytes

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