Malicious PDF — malware analysis report

Static analysis result for SHA-256 6995fa365034f7e7…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 23:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 109376eb8cf732d0474c7abe73212f3e SHA-1: 16723809563fb445a761aaed6e93d9e6d69fa930 SHA-256: 6995fa365034f7e74190c25c9370993fe32ce5a7c8ecd639c9b321d8d5ef75e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by multiple engines, including ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded content indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=wifi+dropping+android PDF link annotation
    • https://dalycity.com/wysiwygfiles/file/18844542389.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/97343884795.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/lemagisegukotedikefori.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/72631610864.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/9014350054.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/vavajoboxutuxugiz.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5c6816a7e---tigilasilogezote.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/fozekamolawotaseka.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/bokesitefezafi.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210911190339860.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/51217208932.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631139538.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b15ccb8b5---fepubumiwede.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/23400396072.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/fubanexesalezutatet.pdfIn PDF document text
    • https://kopari.hu/files/file/32405971697.pdfIn PDF document text
    • http://thaide.org/userfiles/file/xawademovodizivekib.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pujadiran.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/21732614715.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/fuzexedu.pdfIn PDF document text
    • https://cmoretv.com/userfiles/40565917863.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/kikeputegujegi.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/79068915402.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/rajatipom.pdfIn 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://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_off0000e161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE161 18464 bytes
SHA-256: 4306e3308c487339f1de4f4ad23fc017633fcaf5c607e1c61d25e646239337ff
font_01_sfnt_off00011108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001291f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291F 10224 bytes
SHA-256: e78085607003e06d1c589bae34212fa22911cc09c9e6c7ae3e6987775d0e05b9

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