Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda752ad10f7830c…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 15:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82bf9a9c8d799ccd2784f2a006ba1fa9 SHA-1: e8b62a3b95c10777c15b986995f3ea158472a82e SHA-256: fda752ad10f7830c27dc7d110d8610def838e2d66c390a2f6fbde28ffcfbc798
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as https://wastran.ru/uplcv?utm_term=how+to+draw+roblox, are likely used to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and numerous embedded links suggest an attempt to exploit users via social engineering, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 5

  • 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 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://wastran.ru/uplcv?utm_term=how+to+draw+roblox
    • http://skogsformedling.se/bilder_umeny/File/mabuz.pdf
    • http://smenergy.kr/uploaded/file/497973637614ae1dcca9e3.pdf
    • https://turbooto.vn/upload/files/40172094551.pdf
    • http://phoiinnhiet.com/images/uploads/files/21970007152.pdf
    • http://vallovin.it/userfiles/files/2472380808.pdf
    • https://sfeerweter.nl/userfiles/files/povuzemawobufix.pdf
    • https://drivetripper.com/userfiles2020/files/6481918564.pdf
    • http://creptiles.dk/userfiles/file/jewodufabupif.pdf
    • http://tjjjsh.com/uploads/files/wafapeno.pdf
    • https://xulynuocphangiathinh.vn/images/pic/file/wonitavisomiwulevofekinar.pdf
    • http://hyunsin.net/userfiles/file/vafagoxizagomubirogel.pdf
    • https://theshamrockpublecco.it/file/pazijojevafukosasaba.pdf
    • https://digbijoynath.in/uploads/userfiles/files/nixutubalonoralebapoz.pdf
    • http://chrisdepanneservices.com/Sites/cds/files/13524789148.pdf
    • http://bursaceyizgelinlik.com/images_upload/files/81389751202.pdf
    • http://hrjok.com/uploadfile/file/77496072704.pdf
    • http://glovimex.com/uploads/ckfinder/files/sugazijuduxipav.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9041b9fa6---jilesuneb.pdf
    • http://dsagco.com/Upload/file/vavema.pdf
    • http://self119.net/upload/userfiles/2021/09/files/210905023731.pdf
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/83410293559.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/1d31247685a30d675a099f044909f73a/rixofevutigofuzo.pdf
    • http://zhuoer.ltd/userfiles/file/doruzodisilovoturewonokag.pdf
    • http://rexant.by/upload/editor/files/xuxejafivez.pdf
    • https://lescourailleurs.com/upload/editor/file/4188365167.pdf
    • http://htwy.com/upload/file/40962556249.pdf
    • https://motelandratecuci.ro/userfiles/file/fedesutetizixonogugu.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b609.bin
df152fb04df6834cbd3b0ce1a546efb7336ed1e27ed576ee691c3693349ac8c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB609 16612 bytes
font_01_sfnt_off0000dff6.bin
27fa6783badfb457b091797424ed3f6e34b3a4080fb023c0eac0fc8064a77005		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 10064 bytes
font_02_sfnt_off0000f675.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 16792 bytes

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