Malicious PDF — malware analysis report

Static analysis result for SHA-256 def2cd74453f7a29…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 05:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6a975c508da0839eb433ee5d85ae138 SHA-1: f95dd68a0d6145fb014c0ee69ccccdabebc9e2d2 SHA-256: def2cd74453f7a29c002c3fbe9e4ed3f899b634cacc25e7d76a8c47d0299b4e4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, embedding a large number of URLs pointing to potentially malicious content. The presence of numerous embedded URLs suggests an attempt to direct users to external sites for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://dorapeyzaj.com/userfiles/file/jopafuveresomoxasi.pdf
    • https://vetamblj.si/ckfinder/userfiles/files/54156592308.pdf
    • http://suphammamnon.org/uploads/files/77386735874.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161355bdf751d2---mimulajiloxi.pdf
    • http://rosg.net/sa_upload/userfiles/file/20210919060304.pdf
    • http://moscreen.in/cmsfiles/file/laguwemupomafotoligirezu.pdf
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/63677695785.pdf
    • https://sofupingame.com/calisma2/files/uploads/21870612205.pdf
    • http://circolosilverblufitnessclub.eu/userfiles/files/xonala.pdf
    • http://studioindelicato.com/userfiles/files/labaxaxidoduzizevagusu.pdf
    • http://yuanhebiotech.com/upload/files/61449630629.pdf
    • http://mtjjt.com/2013/upload/article/files/210908115449079109km9an.pdf
    • http://2478.ru/admin/ckfinder/userfiles/files/33703131691.pdf
    • http://fpole.ru/sadm_files/jopisetevo.pdf
    • http://konferencii.org/web/uploads/assets/file/83231631729.pdf
    • https://electroagro.es/pub/files/debofotuwinorojozux.pdf
    • http://massimobertoarchitetto.com/userfiles/files/80199880599.pdf
    • https://emailchopper.rockeit.com/userfiles/file/piribadadodenad.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/zuliletebedalamib.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/a2420da6ab82c9001be308b8d75978f3/paxaxevewazabajumoxujubo.pdf
    • http://modern-pro.ru/files/file/garopifurisarafako.pdf
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/xuvafanovogitifuw.pdf
    • https://cbdc.co/uploads/ckfinder/userfiles/files/94301538839.pdf
    • https://ottopianos.nl/files/militobemijugexagiwuto.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=survival+on+raft+crafting+in+the+ocean+hack+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_off0000d448.bin
d6862d0a0f2bb2d7fc7fcaba7cacd915aa35e6c773efccc02b7e33132744235a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD448 16776 bytes
font_01_sfnt_off0000ff97.bin
af7b0b05b2c88d778b0e74d0d9efe67e4d545b415fbf8af5e808acd458947882		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 10924 bytes
font_02_sfnt_off000118e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118E3 16792 bytes

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