Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea856e8ed2a5dc03…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 01:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdfd33324f01095b583eb2c5b8c37d8f SHA-1: 1991a84b5d33b8d664a7d54ad95d0f96cf8b6054 SHA-256: ea856e8ed2a5dc039b837f42e0878dbd928d3199e2f952769bb0ac1cc9c01879
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of external URIs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://susutour.com/userfile/file/kajorin.pdf
    • http://jingluo.net/uploadfiles/files/69772767529.pdf
    • http://vning.net/filespath/files/20210909120331.pdf
    • http://iberia-ex.com/images/blog/file/fevebokofanimagob.pdf
    • http://beta-rc.com/upload/files/zawetuwalusikuxe.pdf
    • http://medtravel.pro/images/hand_uploaded/files/bodeboluzaj.pdf
    • http://hiroi-es.info/yamituki-n/uploads/files/17687020130.pdf
    • https://mebelihome.ru/upload_picture/zidup.pdf
    • https://sapsda.org/SapmaUserfiles/file/15898711248.pdf
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/jotejorip.pdf
    • http://reguitti-engineering.it/userfiles/files/powidiputowaxizetoj.pdf
    • https://alteanetworks.fr/img/file/suxubopixowakaxis.pdf
    • http://chaukitchen.com/uploads/files/xigezaxapiranuladosuxej.pdf
    • https://ekransamara.ru/files/jikotunarulobuxorigag.pdf
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/56771223753.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/87277409489.pdf
    • http://noithatphathuy.com/Images_upload/files/98576715104.pdf
    • http://dioceseofniranam.org/userfiles/file/nupepixexik.pdf
    • https://onlineadda.net/ckfinder/userfiles/files/verupiresogunova.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161396a9a24173---zetipifefodiwuzur.pdf
    • https://schmitz.cz/res/file/37342929882.pdf
    • http://sino-web.net/filespath/files/20210902225120.pdf
    • https://dermatologie-francophone.com/userfiles/file/75440029965.pdf
    • https://congchung7.vn/upload/file/jojulu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=redmi+note+10+pro+vs+x3
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e85862a6e6---55030356609.pdf
    • 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_off0000d76c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD76C 16792 bytes
font_01_sfnt_off0000ef7e.bin
611b064956e91c23fdfa7db4b194febccbf7e00fbf3c21eb83f61c3bc72b6f7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 19116 bytes
font_02_sfnt_off0001214c.bin
c4930d2f446abd727724e2e2394b0c958c803b443ddad94eb2f5b22914804c9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1214C 10904 bytes

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