Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9fb187f92319fb…

MALICIOUS

PDF

76.6 KB Created: 2021-09-26 23:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b9a9189cf8aafb22793f6a6768f5ff8 SHA-1: d56422860d2091883eb249acf8e56234cd40d39e SHA-256: 9c9fb187f92319fb54109664ada035ddad5098cb88532d27dd6d877cfbf0764c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF_URI heuristic also points to external URIs, further supporting the attack pattern of luring users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://smartdeal.pl/files/upload/files/datezebazomidoxivunu.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b22689f2e5---77028603674.pdf
    • https://oncetrabzon.com/resimler/files/pibegivanif.pdf
    • http://zsmnowakowski.pl/userfiles/file/19763309393.pdf
    • http://suliaox.com/v15/Upload/file/20219754517254.pdf
    • https://people11people.gr/uploads/File/sijorojopud.pdf
    • http://sowiik.pl/userfiles/file/43751165197.pdf
    • http://utpcomp.ru/uploads/files/32535328024.pdf
    • http://daphongthuyhueminh.com/uploads/image/files/pipufobib.pdf
    • http://119pump.net/d/files/4690600171.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/10954490306.pdf
    • https://luathoanghuy.com/uploads/files/95821972499.pdf
    • https://ntiverification.com/userfiles/file/bijililumurisupigojevewir.pdf
    • http://sungsam.net/userData/board/file/37651884435.pdf
    • http://luluscafeonline.com/uploads/files/586577605.pdf
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/naginixomanamizupapix.pdf
    • https://zbmbudomont.pl/userfiles/file/91175519832.pdf
    • https://wolfgang-photography.com/userfiles/files/96408785866.pdf
    • http://boxethai38.com/upload/file/folegevodafotire.pdf
    • http://budka39.ru/files/rugozevasenezokelunesa.pdf
    • https://alusol-kw.com/ckfinder/userfiles/files/92677724823.pdf
    • http://ninda.vn/userfiles/files/69693714279.pdf
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/45665701184.pdf
    • https://mayphoviet.com/media/ftp/file/duzaduxe.pdf
    • http://highspiritsmusic.com/ckfinder/userfiles/files/47830630119.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=jungle+cruise+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b39a.bin
50c447826b2b0db4e9d972811dc220debbafe6dba21c670c68cea3df57859635		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB39A 16380 bytes
font_01_sfnt_off0000dd01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 16792 bytes
font_02_sfnt_off0000f512.bin
e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 16632 bytes
font_03_sfnt_off00010ca4.bin
215731d28dbb2261d8cb0a3ed0a84acb89e3261530571de157899f4abf2936e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA4 10344 bytes

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