Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f7266603b4c4ed…

MALICIOUS

PDF

67.8 KB Created: 2021-09-25 11:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8783e6a1574813fa8d3dbec5b605ce39 SHA-1: 2566a325803d6398137839cf6ed1cb564f6d4926 SHA-256: b8f7266603b4c4ed35fe0225cb9db5ebc74fbd50799dfde40d17f659a11c505e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis identified it as a link farm with numerous links to disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful sites, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fizjolech.pl/userfiles/file/fijovofujemolixatuwedunix.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161372c5592098---77653633605.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141d648ccb4d---varexiwabal.pdf
    • https://alsultantrading.ae/userfiles/files/55882765718.pdf
    • http://sugarfree-gelato.com/upload/file/42082761063.pdf
    • http://leaguengn.com/userfiles/file///14691040578.pdf
    • https://balajitutorial.com/admin/userfiles/file/82870430864.pdf
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/bexerenajimofeluzurenob.pdf
    • https://littleitalypizzany.com/nbloom/fckuploads/file/96226096555.pdf
    • http://industrialsupplies.pk/userfiles/files/37307240860.pdf
    • http://joeun-it.com/userData/board/file/1890033951.pdf
    • https://proartgaleria.hu/files/files/73539313045.pdf
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/pozewupilelezizote.pdf
    • https://alutat.com/data/file/vafoxuvorupa.pdf
    • http://cnfglgreat.netsociality.com/upload/files/wugipavu.pdf
    • http://barefoot.pl/userfiles/file/18275540954.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=windows+8+pro+activation+key
    • 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_off0000a6c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6C8 16792 bytes
font_01_sfnt_off0000bedf.bin
b00dae07f3e2b9b66ed575fbff65c6d0443ec3306757a7f581e2d9cbafeb579d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDF 11020 bytes
font_02_sfnt_off0000d8b8.bin
241634e0b82165e487fe8b7218de79c63b97c7480b05ce50c8cc542737cae560		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 16404 bytes

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