Malicious PDF — malware analysis report

Static analysis result for SHA-256 606f4b1c15db7603…

MALICIOUS

PDF

74.1 KB Created: 2021-04-04 08:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb79e08ec1a7ec36d38e2e3673bfd7f6 SHA-1: 7f86978f7b757b4c341ebc5f749fcc059be862f9 SHA-256: 606f4b1c15db760384005eccb73c1d8568e22203ffb4ca81644b92f7cc3782f0
96 Risk Score

Malware Insights

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

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an external URI pointing to 'jacksth.ru' which is likely a lure to download a malicious file. The document body, though heavily obfuscated, appears to be a search result for a technical book, suggesting a social engineering tactic to entice users to click the link and download a further payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=operating+system+concepts+9th+edition+pdf
    • https://cdn.sqhk.co/kikutajaz/diiZjeh/gestion_de_la_pharmacie_hospitaliere.pdf
    • http://ch-bewertung-2888.xyz/nodiwobadodikupewagalpr4a.pdf
    • https://cdn.sqhk.co/lofesaxudiwo/ioieFjd/anakin_skywalker_darth_vader_transformation.pdf
    • https://static.s123-cdn-static.com/uploads/4422622/normal_5fcb737cb2149.pdf
    • http://help-copyrighteamservice.com/fisher_price_cradle_n_swing_assemblyqgbzh.pdf
    • https://cdn.sqhk.co/daposofoxig/YhcXjcI/best_free_online_piano_lessons_for_beginners.pdf
    • http://mihetos.xyz/gisozavoraturogaluglufe1.pdf
    • https://cdn-cms.f-static.net/uploads/4406806/normal_602a87ebb70e8.pdf
    • http://cashbackmoney.info/20234632104bzloa.pdf
    • http://maleev.online/75217343706n4lyi.pdf
    • http://genoray.pro/wawavojefazuzbaed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nafoxuda/wotuxesaz.pdf
    • https://s3.amazonaws.com/wovugi/jokifejuluroniduxaxugo.pdf
    • https://s3.amazonaws.com/sesafefanulokam/on_green_dolphin_street_lyrics_meaning.pdf
    • https://s3.amazonaws.com/nefunupu/kovoxevijopagofeze.pdf
    • https://s3.amazonaws.com/fizufapu/cairokee_album_2019.pdf
    • https://s3.amazonaws.com/waxegatulo/12900252361.pdf
    • https://s3.amazonaws.com/kumasala/nowupe.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_off0000e40a.bin
2b18fb5e8d5433857f95c6f283e05a7105efef576b6bd09546a2e8601d5470a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 5824 bytes
font_01_sfnt_off0000f7b8.bin
abe0f379002e22c8585542fe9220dea57f898340f3cd1131f693eea88d6c031d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B8 10436 bytes