Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84a15bf0f7355c6…

MALICIOUS

PDF

79.9 KB Created: 2021-03-21 00:35:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33d47bc69f78b5065f0ea9b089c1fa09 SHA-1: 90ad8b21d51ecb06151ae11024cd68fdc30aae1f SHA-256: a84a15bf0f7355c69fb5b18da587458adf33a9bb27f314708cd09192cde0e86f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary URL, https://jacksth.ru/strik?utm_term=latitude+e7470+battery+not+charging, appears to be a lure for users searching for specific technical information, likely leading to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=latitude+e7470+battery+not+charging
    • https://cdn-cms.f-static.net/uploads/4478951/normal_601d9785e140e.pdf
    • https://static.s123-cdn-static.com/uploads/4483851/normal_5fffe5924f2e0.pdf
    • https://cdn.sqhk.co/moxoxitij/biigijj/axis_football_gameplay.pdf
    • https://cdn-cms.f-static.net/uploads/4365563/normal_6024f8c80a87d.pdf
    • https://jasemoluzisad.weebly.com/uploads/1/3/5/9/135968146/b154fbf.pdf
    • https://jinimajaloxole.weebly.com/uploads/1/3/5/3/135314869/741ad6.pdf
    • https://cdn.sqhk.co/duzoxibuf/ieUgcib/hockey_coach_lineup_and_roster_assistants.pdf
    • https://xibimitavidin.weebly.com/uploads/1/3/1/8/131871740/bunegufutizo_xifigaxafavax_zupipalamobod_rizukozilag.pdf
    • https://cdn-cms.f-static.net/uploads/4465147/normal_5fd629e4541ee.pdf
    • https://cdn.sqhk.co/zogobadakedu/I1gfAjj/sky_rolling_ball_games_3d.pdf
    • https://cdn-cms.f-static.net/uploads/4460477/normal_60112dae122b4.pdf
    • https://cdn-cms.f-static.net/uploads/4489846/normal_601b6436f414a.pdf
    • https://juxatameserog.weebly.com/uploads/1/3/0/9/130969062/52e9a.pdf
    • https://static.s123-cdn-static.com/uploads/4444875/normal_5ffe0913ce517.pdf
    • https://static.s123-cdn-static.com/uploads/4455890/normal_5fc78e1f0d00e.pdf
    • https://cdn-cms.f-static.net/uploads/4489041/normal_5fda83fe6f381.pdf
    • https://durunefa.weebly.com/uploads/1/3/4/7/134712847/vujup-lawas-jujofulu.pdf
    • https://cdn.sqhk.co/janimivaxo/5mjhicM/pirate_battle_royale_io.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000f82d.bin
e4413e580c362b6771bcd4b9a19651337c3f2db06f51ae6bfece13c42f17d34a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 5484 bytes
font_01_sfnt_off00010ae3.bin
581e63f4ae5429adb1b3b038ae61394f33db3c2806ab0894aa890fa8a8e5dbd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE3 11144 bytes

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