Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dad615da6d1eaa…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 23:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 186df8727160f3889c89588826663f31 SHA-1: eb633dc561c20f89da30eba8523272e1dc38d87d SHA-256: a2dad615da6d1eaa23808f0e31f1e8740cb75e1c14987f3c4a2ed33e94c797c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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=ytmp3+apk+free+download
    • http://canvangdientu.com/images/file/fojejasukuxivawanulesigir.pdf
    • http://rtm-plus.com/ckfinder/userfiles/files/mupakofak.pdf
    • https://nucamsa.es/userfiles/files/74502384780.pdf
    • https://nilsahost.com/calisma2/files/uploads/saregivupebizenaberapon.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/73294837537.pdf
    • http://rrarental.org/upload/file/35400850410.pdf
    • http://tjsyjdq.com/v15/Upload/file/2021951615472092.pdf
    • http://myesen.life/userfiles/file/82720975217.pdf
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19079682547.pdf
    • http://penzion-u-zamku.cz/files/file/76470476105.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613aff1c2f268---19305399497.pdf
    • https://stpeterscbs.ca/ckfinder/userfiles/files/tarojevijoxudoxekilez.pdf
    • https://hlj-vibration.com/uploads/image/20210908/files/20210908091828.pdf
    • http://sushiosushi.com/uploads/files/78651632361.pdf
    • http://take114.kr/FileData/ckfinder/files/20210911_C7220963D0932715.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/worekizapufufejozimis.pdf
    • http://sanfrancescovet.com/userfiles/files/gixesa.pdf
    • http://uni-farm.pl/ckfinder/userfiles/files/xonorazakenerelesirovib.pdf
    • https://coverline.ro/userfiles/file/38424302730.pdf
    • http://hzbmsj.com/images/upload/File/ginadebalaliwexapipiwejen.pdf
    • https://ceccarbotosani.ro/userfiles/file/99662284234.pdf
    • http://vaikevai.com/ckfinder/userfiles/files/61926270445.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/3iv0fcfs59om10m4nm3lscq658/pixapamowujexitovo.pdf
    • http://cableesmaltado.com/d/files/bozunafepis.pdf
    • https://saatyapi.com/upload/ckfinder/files/37687137087.pdf
    • http://isvpro.com/custom/files/jadekoduja.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_off0000b309.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB309 16792 bytes
font_01_sfnt_off0000cb20.bin
7bf95ab02dab0afeab8db0530fa7b2bd3478e6ed6a0616c6d95c9e6a0def59ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB20 10732 bytes
font_02_sfnt_off0000e3cc.bin
54be2f6fb19e9f3e608a3daac1a093bb082d78526a7d3505c933c42840db6b80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 15556 bytes

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