Malicious PDF — malware analysis report

Static analysis result for SHA-256 b356dfc75e920e6c…

MALICIOUS

PDF

75.2 KB Created: 2021-09-13 12:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e6d953e225aaab949e29680988ad6f4f SHA-1: feeec90d97bc3e334b4601cd1de63942b2025c16 SHA-256: b356dfc75e920e6c901b006c781919e812f4427b5d6f29b64a5b7b314792311e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or disposable domains. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to external, malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://balajitutorial.com/admin/userfiles/file/30417113660.pdf
    • http://liceoadultos.juniorcollege.cl/userfiles/files/xemataviwure.pdf
    • http://fuku-zou.com/userfiles/file/55748170430.pdf
    • http://fanghsin.com/uploads/files/202109121634233497.pdf
    • http://dailitara.lt/bites/uploads/file/togizelijojo.pdf
    • http://diakmelo.hu/ckfinder/userfiles/files/49509351510.pdf
    • https://textosolutionslinguistiques.ca/upload/editor/file/kirexewilexituzomefixize.pdf
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/tazadiwakolumatuweme.pdf
    • http://xinge168.com/uploads/files/20210902023727_298259.pdf
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/31940629718.pdf
    • http://lammensfilip.be/uploads/files/bidobekare.pdf
    • https://annekienlen.fr/imagesfile/pisebinopugu.pdf
    • http://metrominicabs.com/survey/userfiles/files/junajemunajozoliboridin.pdf
    • http://worthingtonpark101.com/userimages/67379046426.pdf
    • https://onecre.com/images/content/files/9200034537.pdf
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/dopukudopomabasoruborod.pdf
    • http://geasit.it/userfiles/files/83468183976.pdf
    • https://seeandhearbetter.ie/img/shop/contents/jujitodajutawero.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5d2ce43ebeb9e49dfd4efb0b6b3c63dc/69622457271.pdf
    • https://rails-bg.com/fckeditorfiles/file/3802188386.pdf
    • http://honeycontacts.com/uploades/userfiles/file/dabururalesep.pdf
    • http://hai-bi.com/uploads/files/202109040211234287.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=licence+check+sindh
    • http://elezioni2014.gds.it/userfiles/file/85605223369.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_off0000c37c.bin
156a1301bced013c684362651246a14720d6d227720356b2ee350cff76e7fff3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC37C 17664 bytes
font_01_sfnt_off0000f113.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF113 16792 bytes
font_02_sfnt_off00010929.bin
561cad27e87961fbaf97bae37072404f10c2813bcb35a834b95fe8f35bb78081		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10929 9988 bytes

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