Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05f4934e4a44e02…

MALICIOUS

PDF

73.3 KB Created: 2021-03-23 15:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b25d61ae1f52e9defdb501862f869187 SHA-1: 51b0a6802042c52bdee33244110d21cee268b00e SHA-256: c05f4934e4a44e02379a0f3b78eb3202f17eb4852a1cc6805b19276debe60ce2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a mass of external links, including one to 'ponafet.ru', suggesting it is part of a link farm or phishing campaign. The presence of embedded URLs and the PDF structure strongly suggest it is designed to redirect users to potentially harmful websites.

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://ponafet.ru/strik?utm_term=is+indian+stock+market+is+open+today
    • https://cdn.sqhk.co/xusarukave/geGZcHj/zudusakuzofeba.pdf
    • https://cdn.sqhk.co/jadepibake/jdpTmia/free_movies_hd_2020_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4413126/normal_5fc6d03537ef5.pdf
    • https://waragorejitise.weebly.com/uploads/1/3/0/8/130813548/8812908.pdf
    • https://cdn.sqhk.co/bijowiroma/fXZDjah/52533378755.pdf
    • https://cdn.sqhk.co/xojoreve/hG8D3gh/temple_horse_ride_fun_running_game.pdf
    • https://cdn.sqhk.co/popaxutu/CihiSji/army_bike_3d.pdf
    • https://cdn.sqhk.co/bafuberudod/iOgjZjc/32595362273.pdf
    • https://static.s123-cdn-static.com/uploads/4470985/normal_5fcb56483b1da.pdf
    • https://xubajibagi.weebly.com/uploads/1/3/1/3/131378916/fomagodumawutuvob.pdf
    • https://cdn.sqhk.co/ganinidunop/Ev8gdwp/94042647695.pdf
    • https://cdn-cms.f-static.net/uploads/4377410/normal_604d9fb68ef1a.pdf
    • https://cdn.sqhk.co/zupitefa/b0Ha0hi/xagasozixorametazirute.pdf
    • https://cdn.sqhk.co/figakeves/PgcTwBO/us_army_infantry_iphone_wallpaper.pdf
    • https://cdn.sqhk.co/leloxoreje/ghhfhgE/bubbles_classic_online.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0fd23845-3226-41da-ae74-711f3368280f/56102239583.pdf
    • https://uploads.strikinglycdn.com/files/51ba942a-a7a3-4e79-ad98-2908fb7d8a09/poulan_predator_18_chainsaw_replacement_chain.pdf
    • https://uploads.strikinglycdn.com/files/7ba8b175-5f57-4bbe-92cb-d8cb6791d23f/zufolapotogi.pdf
    • https://uploads.strikinglycdn.com/files/874709e4-61fa-45bb-afde-a1ced7fd15d2/21482498419.pdf
    • https://uploads.strikinglycdn.com/files/d44e39fe-a498-4b88-91bb-b6ca5bb12ac2/62747461212.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_off0000dda6.bin
7948decd3e6773b9fde576ccd6cd2e456eccbee7d96f14150d7c08a2064481de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 5288 bytes
font_01_sfnt_off0000ef98.bin
ced67542ad710f5b814e8c28aa4a81510adb2479b98d03131cafcc0e299d59c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 11280 bytes

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