Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d3d0f59346898c…

MALICIOUS

PDF

79.1 KB Created: 2021-03-28 13:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4f77ab45abe02618e88918d42dd95bb7 SHA-1: cda70dddefbbf700b78dd5d1b26fceebd99ba0e4 SHA-256: 72d3d0f59346898c6233c1ffe1fd64c84615257970d58b108cfad1c34926d581
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://mezovuduw.ru/strik, which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/strik?utm_term=motorola+n136+bluetooth+headset+manual+free PDF link annotation
    • https://cdn.sqhk.co/wotirixa/YTIjdQV/happy_water_game.pdfIn PDF document text
    • http://xamojopilupivo.scienceontheweb.net/systematic_inventive_thinking.pdfIn PDF document text
    • http://juwoniki.getenjoyment.net/b_tech_colleges_in_maharashtra_list.pdfIn PDF document text
    • https://cdn.sqhk.co/gotubosif/gia8wie/comic_and_meme_creator_mod_apk.pdfIn PDF document text
    • https://wulapoledonuker.weebly.com/uploads/1/3/2/6/132695240/wasotoba.pdfIn PDF document text
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/nesinefavevu.pdfIn PDF document text
    • https://kutenamig.weebly.com/uploads/1/3/0/7/130740069/xeminikiji.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/bsjghj4/30883591394.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/joint_commission_international_5th_edition.pdfIn PDF document text
    • http://xuribof.medianewsonline.com/42695135964.pdfIn PDF document text
    • https://bozaveruri.weebly.com/uploads/1/3/1/4/131483492/tejonopesuzaj.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/iajgdvC/amazonbasics_space_heater.pdfIn PDF document text
    • http://savineme.mywebcommunity.org/augsburg_confession_of_faith.pdfIn PDF document text
    • https://subefivu.weebly.com/uploads/1/3/4/6/134688636/pipigu-narigubegotutu.pdfIn PDF document text
    • https://kamowosig.weebly.com/uploads/1/3/1/0/131069991/jamovumakavo-zisomuteve-julebutol-kowoninorif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_bfcb5d77b18041b082d90022f4e705ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9129bb83-bd38-456a-a2f1-90d9ca63bf60/77882411747.pdfIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_94fcdc5963fe4c4884a3edc138bdcf7a.pdf?index=trueIn PDF document text
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_00c7bba15cc04b0690d4cfd5298156a4.pdf?index=trueIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_58ddfc25c19646fc867837a0bc084332.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/986b7d1c-cabc-4cb7-9a95-f556d641756b/6451026667.pdfIn PDF document text
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_6daf5d648cfc4948a1648da625905f53.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF469 5664 bytes
SHA-256: 67b91eb9546eeaa8d8f0a879db31b337fe9c942e0219ddfb14dd4e73f94fd198
font_01_sfnt_off00010783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 11756 bytes
SHA-256: 89cd29c9d913f8db8d87d5e9c8b01b93392ef310483410fae0faef35f12ab990