Malicious PDF — malware analysis report

Static analysis result for SHA-256 187d30841009e979…

MALICIOUS

PDF

86.8 KB Created: 2021-03-23 16:26:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e5f1fce9f0f9b958623ead60c524296 SHA-1: e911d5229c2a79773061172250c1b58bb246c8d1 SHA-256: 187d30841009e9791ec4fbf6b619aa66bae7391247bd75f8a41ac38274902b09
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document employs a social-engineering lure, presenting itself as a "Browser definition pdf" to trick users into installing malicious browser extensions or updates. The document contains a mass of external links, many of which are likely part of a link farm designed to improve SEO for malicious content. While no scripts were directly extracted, the PDF structure and the presence of numerous external URLs suggest it is designed to lead the user to a malicious site or download a secondary payload, potentially exploiting vulnerabilities or delivering further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/award?keyword=browser+definition+pdf
    • https://cdn.sqhk.co/sixatowitur/Hidjbjb/beauty_video_music_video_editor_slideshow_download.pdf
    • https://cdn.sqhk.co/mowasikuso/9q6F9xQ/gegofubodiwirupuv.pdf
    • https://cdn.sqhk.co/wozejodes/gir8ujj/que_toman_in_english.pdf
    • https://niniteju.weebly.com/uploads/1/3/0/8/130814631/metirejo-demikeda.pdf
    • https://cdn.sqhk.co/wixadigizal/6ibgiaN/chevin_pro_font.pdf
    • https://cdn.sqhk.co/dipewoduge/WtNehj1/highway_getaway_police_chase_hack_apk.pdf
    • https://cdn.sqhk.co/xivomojuf/hjgi9ii/82549145022.pdf
    • https://cdn.sqhk.co/nebafaveju/curjejh/kung_fu_tea_set_gaiwan.pdf
    • https://nagiliju.weebly.com/uploads/1/3/1/4/131412426/1720733.pdf
    • http://kukufimivote.iblogger.org/the_raven_cycle_review_tumblr.pdf
    • https://pajuxosam.weebly.com/uploads/1/3/0/9/130968950/7701510.pdf
    • https://rabizelen.weebly.com/uploads/1/3/1/4/131453176/c80330271e0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sidumekubasib.epizy.com/xoxuzulosomigesozom.pdf
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_a03324d393f242c39a8a7e41f007f9ef.pdf?index=true
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_110523d0adbd42299bd3e404805aad5d.pdf?index=true
    • https://s3.amazonaws.com/nilititonawafim/42269979760.pdf
    • https://s3.amazonaws.com/bupijila/dead_or_alive_xtreme_2_guide.pdf
    • http://wuguwusilabibax.epizy.com/rustoleum_cabinet_transformations_melamine.pdf
    • https://s3.amazonaws.com/batiku/kodudopasirinemevezun.pdf
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_cd07d51768b4441891e76eba3fa2f1fe.pdf?index=true
    • https://s3.amazonaws.com/jukezeluf/missouri_river_fishing_report_bismarck.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_off00011833.bin
f8fb4302fe05823fd49e72ed32f4053be6c5987577e6f60b0a57356d66152bdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11833 4936 bytes
font_01_sfnt_off00012924.bin
7ab7f5b3daf1e51bf61fbddd1c433525932dbff257f00a368887f371ced9adea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12924 10872 bytes

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