Malicious PDF — malware analysis report

Static analysis result for SHA-256 c217c83d15cf5cf3…

MALICIOUS

PDF

84.6 KB Created: 2021-09-22 14:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5df7cc89c6fd815dc5ab6e23e9df2f2 SHA-1: dbd44a14460eb4fade9832c40110a2b5d443d08e SHA-256: c217c83d15cf5cf369149b95c994ba67716f2c553ffbb02d26103df5eb9b3b9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, which is a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the ML/ClamAV detections suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://aptwash.com/userData/ebizro_board/file/limawupa.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e2ca5ed6---kijolezolaxibumenepogem.pdf
    • http://de.ruben.pl/ckfinder/userfiles/files/bemexamokovomisor.pdf
    • https://sanipro.ma/app/webroot/uploaderfiles/nuxujifilodexokoxe.pdf
    • https://egokituz.org/files/galeria/files/19984274721.pdf
    • http://eapver.com/upload/ckimg/files/202109170015035054.pdf
    • http://betonkeritesek.eu/Content/files/21777408878.pdf
    • http://gift-founder.com/archive/upload/files/motofokabimuvilasoxubajip.pdf
    • http://rideco.hu/upload/file/86667396512.pdf
    • http://thewellmanteam.com/userfiles/files/bojalejute.pdf
    • http://dkind.net/userData/board/file/penezumitovelavemefe.pdf
    • http://ceomit.com/fckupload/file/siguliwasas.pdf
    • http://insuralead.com/userfiles/file/tasoja.pdf
    • https://efnnma.org/files/file/16424187965.pdf
    • http://amphorabeautyclub.com/campannas/file/52874701283.pdf
    • http://abwpetersburg.com/uploads/files/wavixewaloronufuzu.pdf
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/28491108091.pdf
    • https://laurallo.com/ckfinder/userfiles/files/xubanimorule.pdf
    • http://dermalab.pl/userfiles/file/61335491295.pdf
    • http://abwwilson.com/uploads/files/mefodusidelezijelolidokem.pdf
    • https://widepolymers.com/userfiles/file/bofixonubomurigu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fun+minecraft+things+to+do+with+friends
    • 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_off0000e6b6.bin
ec7ad838022cf652ce2fcb93054ccf1a36d50b13e55598d8d3330d9e4cd6485c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B6 11040 bytes
font_01_sfnt_off0001000c.bin
0781763c57741538e59689ed33d16937ccf87c6c9c1edbf443921ad0330f89fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1000C 16984 bytes
font_02_sfnt_off00012c78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C78 16792 bytes

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