Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91dacaae5089dcb…

MALICIOUS

PDF

74.9 KB Created: 2021-04-06 05:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac75ff4dd77cf72b4d3ece33f3df74e0 SHA-1: d7d1516c7c9c3d83343f5b783b1a91ac1d1401e1 SHA-256: a91dacaae5089dcbef3552a063bf307c622d49ad154ea45ea611f016bc49e989
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'nipisod.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to a 'Skoda yeti 1. 2 tsi manual'. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nipisod.ru/123?utm_term=skoda+yeti+1.+2+tsi+manual
    • http://sinoxaju.mygamesonline.org/empirical_cumulative_distribution_function.pdf
    • http://bamiluzigu.mygamesonline.org/cell_cycle_and_mitosis_packet.pdf
    • https://cdn.sqhk.co/ragejeli/FOijgcm/night_sky_clock_wallpapers_4k_live_wallpapers.pdf
    • https://cdn.sqhk.co/wifuponi/kVjhDhi/siguxuzavuzepiwanegigix.pdf
    • http://xedeporib.medianewsonline.com/58757154255.pdf
    • https://cdn.sqhk.co/dozawulu/eV9Tien/fb_video_via_link.pdf
    • https://cdn.sqhk.co/xonipavu/iaij0hh/has_season_4_of_yellowstone_start.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2eab7e93-7ef3-4a6f-994a-41c74ccd28f9/21748525281.pdf
    • http://lewimidofi.epizy.com/26118390020.pdf
    • http://feferabi.atwebpages.com/twilight_eclipse_cast_seth_clearwater.pdf
    • http://zatozisuxaxabiw.rf.gd/15377340862.pdf
    • https://uploads.strikinglycdn.com/files/4d20d0ce-f2f1-41d2-b9bb-4395b9a77599/shark_rotator_powered_lift_away_with_duoclean_nv800.pdf
    • https://uploads.strikinglycdn.com/files/83d71fc4-901b-46e0-b771-7ea7434182bb/gukulibuxekiwuxedovudapo.pdf
    • https://uploads.strikinglycdn.com/files/14d848b9-f4cf-4e1d-8448-e5a5441303f0/5439636021.pdf
    • http://bidusibebawuz.onlinewebshop.net/jodopokekowifinavoj.pdf
    • http://piperopire.rf.gd/80501869633.pdf
    • https://uploads.strikinglycdn.com/files/aee67966-381f-4ae6-8794-1660d8a94fbc/how_to_reset_casio_aq-s810w.pdf
    • http://pojunusojazop.epizy.com/e_magazine_library.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_off0000e542.bin
e9cb1cbe7ab263de89445473685ad0487945c755f3efbd7be490bcbef3e15d60
pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 5360 bytes
font_01_sfnt_off0000f786.bin
2d371271afa1f952a0b3fd9e3af2013c01cbfa2f7fc6ab546ed47329dac073c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 11568 bytes