Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22c46b598212de6…

MALICIOUS

PDF

97.1 KB Created: 2021-02-20 05:03:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a06e31fabb992a4f98adcee209613c6d SHA-1: 9864aff972c2da278a144641bb1f3f896c90a10a SHA-256: e22c46b598212de6c988d4094f71adcdb8330022bc4a1ce6da4f93ac19aca6da
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one that mimics a search result for educational content, suggesting a phishing or malware distribution lure. ClamAV detected the file as a phishing trojan, and ML classification strongly supports this. The embedded URLs and the PDF structure indicate an attempt to redirect users to malicious sites.

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-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://druttle.ru/wix?keyword=louisiana+history+textbook+answers
    • https://cdn.sqhk.co/xamitarerivu/BxjacDH/48292186339.pdf
    • https://cdn-cms.f-static.net/uploads/4406229/normal_601b88db821b3.pdf
    • https://buwinejelajok.weebly.com/uploads/1/3/4/0/134018081/1433491.pdf
    • https://cdn.sqhk.co/nisifowisom/zXo4icM/express_session_idle_timeout.pdf
    • https://cdn-cms.f-static.net/uploads/4492871/normal_6028e9a49efc4.pdf
    • https://cdn-cms.f-static.net/uploads/4467043/normal_5fdc6c01b2a50.pdf
    • https://cdn-cms.f-static.net/uploads/4367302/normal_601ec3726a246.pdf
    • https://cdn.sqhk.co/jaxabofapuw/ciegdig/zombie_assault_game_3d_shooting_games_offline_pc.pdf
    • https://cdn.sqhk.co/visesefider/gjjihep/kotafeworapolol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xumakomowi/american_truck_simulator_update_1._5.pdf
    • https://s3.amazonaws.com/bededuxotulapil/guvejo.pdf
    • http://bujavajivedejin.rf.gd/collector_for_arcgis_windows.pdf
    • https://s3.amazonaws.com/wanasuvedigo/basic_instinct_1992_movie.pdf
    • http://tuxumojidozol.rf.gd/jolav.pdf
    • https://s3.amazonaws.com/supefujoxopubu/52927924640.pdf
    • http://lufeneweb.epizy.com/dutufitegowajuku.pdf
    • https://s3.amazonaws.com/tasufagijaremo/texomabivavutavutaferala.pdf
    • http://wanabovemuzume.rf.gd/pineapple_pen_apk_hack.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e0e.bin
303dc42b6afd858ea7fb7c828200379eb8a3754de1d4f47dba22500e2a5389fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 5148 bytes
font_01_sfnt_off00012fa7.bin
37fa7bf7e78ca48061274136a3a511dd9db3a11af2f574654a846e4637d0658e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA7 15544 bytes
font_02_sfnt_off00016033.bin
d8a1a34de14a7b8fce5e51635835121d353d188f9ac9ce1e11538509fd4c5cdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16033 16060 bytes

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