Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0190754e9a7f901…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 04:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27696f8a670fc3f005d12c02c390b45b SHA-1: ccb31ddd6ff73529ac79d483236a1455236ecc61 SHA-256: f0190754e9a7f90171f0da1296114c192fffe9a0e594a1b1530500b944f27a0e
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm PDF. The embedded URLs, particularly the one pointing to 'mikomisushiwc.com', suggest a redirection or download attempt. The presence of multiple PDF files hosted on various domains indicates a coordinated effort to distribute content, likely malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://mikomisushiwc.com/uploads/files/rudufiwiwuxigibileg.pdf
    • http://tetrafluoro.com/upload/files/76493323126.pdf
    • http://www.museopizarra.com/ckfinder/userfiles/files/guzuten.pdf
    • http://adance0112.com/upfile/editor/file/besug.pdf
    • https://assignmentmart.com/ckfinder/userfiles/files/79134233522.pdf
    • http://adance0112.com/upfile/editor/file/67112623166.pdf
    • http://vertex-decor.com/userfiles/file/tobodevebugir.pdf
    • http://imhkayseri.com/resimler/files/wumizakipodatijavasorumur.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/pr8i72ngl7km7590ub3p9k3pq2/12298547897.pdf
    • http://kovovyroba-nosniky.cz/UserFiles/File/fomoxodesiva.pdf
    • http://sake2metustin.com/uploads/files/nezoxugonenibumiwa.pdf
    • http://busankid.com/webfiles/board/file///26397466801.pdf
    • https://oxfordjsr.com/userfiles/file/78544313769.pdf
    • http://henanshuangxin.com/d/files/xukod.pdf
    • http://actinq.nl/upload/file/70044726857.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/tuluwomivas.pdf
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/95107938798.pdf
    • https://ahha.az/userfiles/file/bugimozufonowafas.pdf
    • http://wakesup.org/userfiles/file/1085330927.pdf
    • https://poganyvolgyi.hu/userfiles/file/mivosuzifuv.pdf
    • https://www.utn.ac.cr/sites/default/files/files/97639870645.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/15714915834.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=soccer+bet+apk
    • 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_off0000cc6d.bin
ee51d8f9c9e437126369e8b9e3769f513baa0e69e908d3bd9592a36723e9fdfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6D 19880 bytes
font_01_sfnt_off0000ffec.bin
b6b8ed7e8dc1988ba4d420261e95357efb1e70df82174fdfec582d7ed0898448		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 10264 bytes
font_02_sfnt_off000116f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 16792 bytes

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