Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2144e038dfe7b2…

MALICIOUS

PDF

84.9 KB Created: 2021-09-13 11:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: faa000e810519ccd7544e242c2657a3f SHA-1: c02a4d02f165f196b3aa107ef2e64acb5ade1ca2 SHA-256: eb2144e038dfe7b2edd26356a572e294f530c8365d876a50e40fae1bf88c683e
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to various domains, with a high concentration of links on disposable hosting. The primary attack pattern involves directing users to potentially malicious websites disguised within the document's structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://hotlinepro.in/admin/userfiles/file/61222736276.pdf
    • http://wsm.hk/images/uploadfiles/file/27290075639.pdf
    • http://travelsi.ru/ckfinder/userfiles/files/zaburenimiduvokoresi.pdf
    • http://pasted-radio.de/web/files/99910427402.pdf
    • http://namthangbasaltstone.com/uploads/image/files/suzetesuwixupujojivuzeki.pdf
    • https://globalcircle.club/userfiles/file/modimadoladesukogakusifo.pdf
    • https://livredart.com/ckfinder/userfiles/files/xumumodupirisur.pdf
    • http://pasted-radio.de/web/files/letopimotexule.pdf
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/xoxugofo.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/56221067233.pdf
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/roxenosofoloxu.pdf
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/muvos.pdf
    • http://mim2010.ru/userfiles/file/wupetifizeboluvodenuf.pdf
    • https://wisserarm.nl/app/webroot/files/userfiles/files/vebunegejubolepuno.pdf
    • http://www.toptehnik.si/images/76730771397.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e85a445111---40021411721.pdf
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74486505930.pdf
    • https://glaze-metalart.com/upload/files/38373310452.pdf
    • https://www.savininkai.lt/ckfinder/userfiles/files/64191681821.pdf
    • http://geometramaurotozzi.it/userfiles/files/dakunudakubefo.pdf
    • http://onlinetradeshow.ir/uploads/files/lemiporizir.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613190e37c120---mitobikakurebaxunulovago.pdf
    • http://gowowdeli.com/uploads/files/47810132189.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=imo+beta+lite+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caa2.bin
c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA2 16180 bytes
font_01_sfnt_off0000e04b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 16792 bytes
font_02_sfnt_off0000f85d.bin
53bd9ae79a36f1b0632c16b6089990623b4852ab99f501165877da8815fdcd65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 20640 bytes
font_03_sfnt_off00012ceb.bin
c3221ed7c56ef96d82af383a60c49ee6096b2a3125fe010e6d7e80774ee20ecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEB 10224 bytes

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