Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d89a6f0343bf724…

MALICIOUS

PDF

72.6 KB Created: 2021-03-10 06:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56a60e98517e40b16520c1ce8925bdf0 SHA-1: d772429da7d3d77be577a868051df51fb8542290 SHA-256: 0d89a6f0343bf72411ed003c288668c4db48d68b47e1064d068e467126bae2b1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO spamming operation. The primary URL, zajinet.ru, is used in conjunction with keywords related to free PDF downloads, indicating a phishing or malware distribution lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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://zajinet.ru/award?keyword=water+jet+machining+pdf+free+download
    • https://static.s123-cdn-static.com/uploads/4390324/normal_5fd05b2a4a616.pdf
    • https://cdn-cms.f-static.net/uploads/4453537/normal_600e5dd4ab549.pdf
    • https://cdn-cms.f-static.net/uploads/4461761/normal_603c2d9c269f0.pdf
    • https://static.s123-cdn-static.com/uploads/4462985/normal_5fcc7023ea4ba.pdf
    • https://cdn.sqhk.co/rufebumu/jfgiibB/shoot_strike_war_fire.pdf
    • https://gulekikafosevog.weebly.com/uploads/1/3/2/3/132303175/godemomonumube-bubovezarusa-tuxutiro.pdf
    • https://cdn.sqhk.co/nuvurero/hhcKKS9/pixel_space_shooter_2d_retro_space_wars.pdf
    • https://cdn-cms.f-static.net/uploads/4387224/normal_602b35687c14e.pdf
    • https://cdn.sqhk.co/wugunifikezu/igVjhid/gmx_cloud_windows_10_download.pdf
    • https://lurevovikofa.weebly.com/uploads/1/3/4/6/134693735/364891.pdf
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/a4381.pdf
    • https://cdn.sqhk.co/pabefidinaz/atZxPjh/talking_tom_cat_game_download.pdf
    • https://cdn.sqhk.co/nanagajog/USGjegi/70280962397.pdf
    • https://cdn.sqhk.co/piwixesiwufo/ijqLchg/christmas_hair_salon_clipart.pdf
    • https://cdn.sqhk.co/mokevesin/che9Vjg/batman_the_telltale_series_gameplay_trailer.pdf
    • https://cdn.sqhk.co/vilonunufuk/TWzicRp/rock_guitar_hero_games_in_order.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tikofaketonub/nixude.pdf
    • https://s3.amazonaws.com/mafavuzenoliki/14547240930.pdf
    • https://s3.amazonaws.com/jukezeluf/android_design_guidelines_2019.pdf
    • https://s3.amazonaws.com/megodipewukitoj/93977166204.pdf
    • https://s3.amazonaws.com/watajive/pokinavokaruwatozu.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_off0000e0c2.bin
4182b10ac2b012f0857b6fc5e599469ff0280e52c8a52b26b2e83fdcd0645e48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C2 5572 bytes
font_01_sfnt_off0000f3ae.bin
247993d37f3cb7a0ab17b94a4808ac52e0ae1f80718a936ae250e86317c33490		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 9848 bytes

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