Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9a002b29297c71…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 05:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f3bb77a89fcdd08dde75e3a75f55c96 SHA-1: 3994893ad5dbb1df454758db3d0f26b3825158f2 SHA-256: 1a9a002b29297c710d3bd123538e5ac3884782c0fe37f32ed197a85e5014d7ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a lure to phishing or malware download sites. The PDF structure and embedded links are consistent with a phishing campaign aiming to trick users into visiting compromised or malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=indesign+to+pdf+converter
    • https://suativisamsungtaihanoi.net/upload/files/xomukovelebax.pdf
    • http://parateam.cz/file/vodikiloxija.pdf
    • https://smartstone.ca/userfiles/files/xijilit.pdf
    • https://dichvuhappyhouse.com/upload/files/25547739423.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16824052281.pdf
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/3957364791.pdf
    • http://kleiberit.ru/files/file/51114463248.pdf
    • https://la-klamm.org/Files/files/15873603455.pdf
    • http://pc580.cn/upload_fck/file/2021-9-5/20210905105236502231.pdf
    • http://toroisg.com/public/images/files/75968089634.pdf
    • https://pakianco.ir/data/image/uploads/news/files/4682011445.pdf
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/fidojubidamovoz.pdf
    • https://study-abroad-travel.com/ckfinder/userfiles/file/palub.pdf
    • http://hardiebase.com/uploads/assets/filefile/gexogawonifa.pdf
    • http://mcserpenti.com/userfiles/file/sunudonuv.pdf
    • http://healhumanity.foundation/userfiles/file/lanelajoxifabodivokobob.pdf
    • http://agnieszkapawlik.com/userfiles/file/vakatapujogipujusagetov.pdf
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32650132250.pdf
    • http://i-akparat.kz/ckfinder/userfiles/files/tujoke.pdf
    • https://bd-sokolovska.eu/userfiles/file/56481819880.pdf
    • http://deleeuwputten.nl/site/data/ws/files/22619771661.pdf
    • https://dom4m.com/userfiles/files/90958702826.pdf
    • https://www.campacinter.com/image/upload/File/rejiwinoleferejelifan.pdf
    • http://www.smpnuenen.nl/images/files/86818256165.pdf
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/gizapepabax.pdf
    • http://bjallstar.com/upload/file/15991057621.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_off0000dabf.bin
e99eb43899eb81d03a340a125ae7f45c1b33ff900d52c11754719fe8ba68aba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDABF 10604 bytes
font_01_sfnt_off0000f2ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 16792 bytes
font_02_sfnt_off00010aff.bin
099dbb0a815f38ae01414e42d09f27f2eed9ef37396f9e16267ffa5ee1d62071		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFF 16752 bytes

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