Malicious PDF — malware analysis report

Static analysis result for SHA-256 9978cdeaab7866d5…

MALICIOUS

PDF

68.3 KB Created: 2021-09-30 13:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0a6eb9f4522acdf45d976cd0b41bf8c SHA-1: 8df82f6d454bf5239cb7532990c3c1089f2cbd42 SHA-256: 9978cdeaab7866d5516577f787b551a4e5ea0c58c3bb3c47db109e73d494fb3d
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to redirect users to malicious content or phishing sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.almansori-ye.com/almansorifiles/files/57834764970.pdf
    • https://gianlucabruno.it/dati/upload/file/9466958894.pdf
    • http://anhuicrew.com/upload_fck/file/2021-9-7/20210907072434201008.pdf
    • https://www.alugutader.fr/ckfinder/userfiles/files/93873743359.pdf
    • http://smartvoicecom.com/userfiles/66936246860.pdf
    • https://www.karelo.com/uploads/File/megabadekoropaxuvetewip.pdf
    • https://lifecareproduct.in/ckfinder/userfiles/files/togexamekuzitotoxajutetu.pdf
    • https://saikekanglun.com/filespath/files/20210918054519.pdf
    • http://ibookingkr.com/FileData/ckfinder/files/20210902_72E918C484AB96B5.pdf
    • http://terredellamagnagrecia.com/userfiles/files/37685830782.pdf
    • https://kingdom.vn/userfiles/file/90252117573.pdf
    • https://fceresources.com/ckfinder/userfiles/files/petugijunemidufef.pdf
    • http://kbcsisa.com/upload/fckeditor/file/vamofitepote.pdf
    • https://sabunwangi.com/contents/files/nanovog.pdf
    • http://imobilestore.de/userfiles/file/denibafetimuvewegenijibeg.pdf
    • https://globaldreamindia.com/webcms/file/51415311782.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4f3036c5---zumapenabula.pdf
    • http://ks-klinika.ru/ckfinder/userfiles/files/xusomogimivikajowugowopim.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=watch+the+promised+neverland+live+action+online+free
    • 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_off0000ac1c.bin
aff82c89ce5faf144afe44a050c676ad16aa09f5f2919ba599b43a38c1d817c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC1C 14928 bytes
font_01_sfnt_off0000d1c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C8 16792 bytes
font_02_sfnt_off0000e9df.bin
0f24e897afca6aa34bdfba303e178ecc7e24c441a1f2c60a6affb946806df415		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 10944 bytes

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