Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0e0dc164e1d897…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 22:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f8af5b477c4f873d63f1d93f542b19c SHA-1: 9710f1d6980eb6f03bcc13702095e8983e13bd14 SHA-256: bb0e0dc164e1d8972abf0ab52a1e02825b2e5307f2e28b94969f34ae46ba53d3
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, forming a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this document being part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://ccsilver.kr/files/fckeditor/file/1118765325614601a55c29c.pdf
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/zajiw.pdf
    • http://4chan.ro/UserFiles/file/zerufanagedeximi.pdf
    • https://ordermorestuff.com/cmsCart/upload/file/61814524225.pdf
    • http://www.lircai.com/web/inline/file/3970365999.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/60831505948.pdf
    • https://ceiling.holcom.vn/webroot/img/files/74342907849.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142519d1dabb---pegepevorifiwaxofafo.pdf
    • https://dp-silver.com/userfiles/file/lozusodogonu.pdf
    • http://ersenergy.com/UserFiles/file/jojezopoj.pdf
    • https://eghamatkade.com/basefile/eghamatkadecom/files/gokodide.pdf
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/23137221945.pdf
    • https://inprovitecuador.com/ckfinder/userfiles/files/46582043558.pdf
    • http://whuntex.ru/userfiles/file/doxipesu.pdf
    • http://tayles.com/uploaded/57765924841.pdf
    • https://es21sys.com/userfiles/file/30621436016.pdf
    • http://greenearthgardens.org/userfiles/tuvomid.pdf
    • https://residenciasanamaro.es/userfiles/files/xuworejefurogiza.pdf
    • https://barcelonacentromedico.es/files/galeria/files/74159520980.pdf
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/pedefatixazolevexiwe.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/torurafijepo.pdf
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/narodalopun.pdf
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/65077535851.pdf
    • http://joltiy.ru/uploads/files/labemixerupakilejon.pdf
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/fetevadabegosof.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mdm+config+android
    • 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_off0000c663.bin
96fc99d0be4723fcc9763d26430ecafbe4c08453412d5e050676ef7e4232deda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC663 10368 bytes
font_01_sfnt_off0000dd88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 16792 bytes
font_02_sfnt_off0000f59a.bin
8f29ab1f5fb7f158545357b846cb85992690dde555603733ed86cfa61968fdfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 17224 bytes
font_03_sfnt_off0001225b.bin
658aa45e6a8d5c498881790501e3a1abac20a84f5887979cc9f2873b4bbd9bcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1225B 2228 bytes

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