Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c93c6365fee3754…

MALICIOUS

PDF

78.8 KB Created: 2021-09-13 17:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b2a5a5bc4201062c2814c1350eea3c86 SHA-1: dfe63649838e3a6058047d00740e456bc8343ad8 SHA-256: 0c93c6365fee37545ae26c3f6c16b8e1c90e1fd850e93078d468211c30bc96df
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate the PDF contains a link farm and a deceptive download button, suggesting a phishing attempt. The presence of callback lures further supports a social engineering attack aimed at tricking users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://fasson.vip/images/editor/files/23957336386.pdf In PDF document text
    • http://kfoodntea.com/dataroom/file/dasex.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/zovoxosanuwigutumuvamux.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/vubopozadosuwogaka.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/nukisowom.pdfIn PDF document text
    • http://swhos.com/upload/files/84149139520.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/wexaponapiruzobo.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/43221317986.pdfIn PDF document text
    • http://espicycooking.com/files/file///82405028490.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/nunamugixoxisopikiketaza.pdfIn PDF document text
    • http://kes.org/upload/editor/files/44364420291.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/xakanad.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/gbqm812b1k1212imm7g4aqurd1/25492979734.pdfIn PDF document text
    • https://loctra.net/userfiles/file/dunabefununidekajat.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/31454308493.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/55182097872.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/6771037680.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/sisenilesexexuxiwenu.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/13484072872.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/xelupulejugolebu.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/70597593868.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/gozowoxor.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324a8ad0225---biketatojetidubusenone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+print+pdf+largerPDF 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_off0000d18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18B 16984 bytes
SHA-256: 5b7ec162d52ec4ac3c2a91f9a616776776c7544a7596ecf0aef7e14ac8a64437
font_01_sfnt_off0000fd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 10584 bytes
SHA-256: 1dc0519265259668c8136d4a9eddd5d67252dcd2f8c3f2345b1ce4e711fa38d6
font_02_sfnt_off0001158d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1