Malicious PDF — malware analysis report

Static analysis result for SHA-256 f692a5154f634831…

MALICIOUS

PDF

78.8 KB Created: 2021-03-11 18:57:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92385684927731652bdd14c13f98a6dd SHA-1: 1a8ecf74624cb876aeed15925f3f3b7ef99be6c9 SHA-256: f692a5154f634831dfefaf4b000dc355b657f71871ee9060968d66049ae93cee
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, disguised under a seemingly innocuous topic. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing or trojan PDF.

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://fokemale.ru/wix?keyword=roman+numerals+1-20+copy+and+paste
    • https://cdn-cms.f-static.net/uploads/4494883/normal_6034176f3ada0.pdf
    • https://cdn-cms.f-static.net/uploads/4416501/normal_601bb7b99d7cf.pdf
    • https://cdn.sqhk.co/fudimesa/cDhjkIj/dice_heroes_apk.pdf
    • https://cdn.sqhk.co/bikugipozamu/Xigivja/pelowukajotivoxif.pdf
    • https://cdn.sqhk.co/rapawomo/hhg2bYP/idle_tap_airport_mod_apk_unlimited_money.pdf
    • https://cdn.sqhk.co/bojodunaluko/cfhQAgd/fantasy_forest_wallpaper_mobile.pdf
    • https://pigamudabuv.weebly.com/uploads/1/3/4/2/134235231/redaga.pdf
    • https://cdn.sqhk.co/minamojazi/RtjepSp/94981843324.pdf
    • https://cdn.sqhk.co/patagarinixa/i4DjaNW/43062291845.pdf
    • https://cdn.sqhk.co/tarekekog/JjchdrV/1978077746.pdf
    • https://cdn-cms.f-static.net/uploads/4417306/normal_6011df5b0931c.pdf
    • https://cdn.sqhk.co/lopumilekana/2ihhhig/65131711141.pdf
    • https://gewilede.weebly.com/uploads/1/3/4/3/134311853/9fd05d6c245.pdf
    • https://cdn-cms.f-static.net/uploads/4392659/normal_6034511f3858b.pdf
    • https://static.s123-cdn-static.com/uploads/4416502/normal_5fc98fcac30f3.pdf
    • https://cdn.sqhk.co/fufigavaki/djegcbD/22_clues_word_game.pdf
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/3975d4921b.pdf
    • https://cdn.sqhk.co/nenutipu/qb8jjgj/76393595820.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_3f66cf02c943410fb86f4abf87a4b627.pdf?index=true
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_2ebba4756dcb40b4a45883af40e3bb92.pdf?index=true
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_7e6cd54557ea4b398164cb7c065cda47.pdf?index=true
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_5ee1688044c14808995465e67b408060.pdf?index=true
    • 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_off0000efc2.bin
cf33b4640af30b436e5e8b3fe4e18b30424050555eb08f37a84ccb12da223938		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 5684 bytes
font_01_sfnt_off0001030f.bin
45e6f65de0aeebc9367cfd2557d7ad9c781455d8e2823323375da43a4ee83c9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1030F 13168 bytes

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