Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93c602acaff995a…

MALICIOUS

PDF

76.6 KB Created: 2021-09-19 07:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07f9114fc959e3e844443ca83aa6e135 SHA-1: d0572bbb4df311579ce90cc2389c176ae45466c0 SHA-256: b93c602acaff995ac5acef74a99525fd4995a2ed843446a9cb01b0c3780da352
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host a large number of links, pointing towards a link farm strategy. While no scripts were explicitly extracted, the presence of numerous embedded URLs suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://tidurmalam.com/contents/files/67066072048.pdf In PDF document text
    • http://tnshoppingbag.com/upfiles/file/92398670862.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/vavazotades.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/bozaga.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/roredodevatari.pdfIn PDF document text
    • http://goldmustang.com/files/files/faxiziwuxevasoxegobovof.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/bemibuwosagavesetud.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/49796764088.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/wumikobawisajiwap.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/76761592042.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/62183511724.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a67783991b23e3e55c36bf22dbcedf8d/kapetapepem.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210914195048.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/pasujobujefuduna.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/jituwiko.pdfIn PDF document text
    • http://koala-al.com/d/files/nunepidaxapusesefilinop.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161331cec6e4b4---kabuwabujafinekofokodir.pdfIn PDF document text
    • https://protum.se/file/64776158488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=phone+number+for+gta+5+cheatsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 16688 bytes
SHA-256: fcb08d49d0f9f111e22045e2d8080373228b000ce64f1cd2194d5a6e244c4ea6
font_02_sfnt_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 11020 bytes
SHA-256: 246d62576628d9affce0e24fea98fc26615aab8751d00a585598b069628891b3

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