Malicious PDF — malware analysis report

Static analysis result for SHA-256 9165ab39ebe05062…

MALICIOUS

PDF

84.2 KB Created: 2021-09-23 07:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 658445fc52ecabe4f89f8b8f23f45558 SHA-1: c0274d947193a27758a749cfae5af0d6122c9684 SHA-256: 9165ab39ebe050624924689c13326ab119815827b8781c16af7ebe1c4c4ea670
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URIs pointing to potentially disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high likelihood of this document being used for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://777mto.org/contents/files/91942645883.pdf In PDF document text
    • http://derivat.sk/files/49679776742.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/nokorarotalopagifikovawo.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/pumefimego.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161376170d5815---75665268818.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/40970417598.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130ce0cc344d---27802180323.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/23489116032.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/96968344561.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/42198216522.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/9525171228.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/dugokozuziboxumub.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210908_4407E33F2C718352.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/neluz.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/jujakajafafu.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/wadajomaladotuzovolimow.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/rupoxuxu.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/17393717177.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/40808161814.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/feteguworunubi.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/63537748003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=venom+telugu+full+moviePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE18 10264 bytes
SHA-256: 19507fa16d56441db510e3f44a718cc3e0ed590ffddeff44659866e9545661c9
font_01_sfnt_off0000f52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3E 21252 bytes
SHA-256: 6a38e78e9edf5466fb705dd84bd8160e511b929ec22e5f1a2a0f4d54d70935e4

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