Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf3f234086e74ba…

MALICIOUS

PDF

75.3 KB Created: 2021-09-12 05:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a89bb715805e1b00bdba761dae198fae SHA-1: 374e40f77b4e2de5afe0fec9cf99cb20caf424e5 SHA-256: 5bf3f234086e74ba57d4f54b196c039eb683e654778eca2044ced5ecf5e0281d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs, including one pointing to a potential APK download, suggests the PDF is designed to lure users into downloading and executing further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing or malware distribution nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=secret+neighbor+mobile+apk+no+verification
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/57720749903.pdf
    • https://greenline.bg/userfiles/file/74965328916.pdf
    • http://rszm88.com/upfolder/e/files/20210905095924.pdf
    • http://netcentricnj.com/ckfinder/userfiles/files/xowimagi.pdf
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/47610245670.pdf
    • http://insei.eu/userfiles/files/34122412510.pdf
    • https://daotaolaixesontay.com/uploads/file/folizukozowimaziduguk.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136479311af3---vutodu.pdf
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/31253128851.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d390102e9f---7582237550.pdf
    • http://fsf-vastroad.com/userfiles/file/61334081198.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/mesopekotorikekumaxize.pdf
    • http://kastely-vacduka.hu/fileok/file/59482443437.pdf
    • http://studioindelicato.com/userfiles/files/68123679968.pdf
    • https://e-midas.ro/files/file/detefazosilotemi.pdf
    • http://www.guus.edu.mn/ckfinder/userfiles/files/taxorokuvu.pdf
    • http://nexxosrealty.com/userfiles/files/sapaxamor.pdf
    • http://studiogiamberardino.it/userfiles/files/81303036112.pdf
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/kotovufareregixazesenafat.pdf
    • http://barcelonasixtytwo.com/userfiles/file/fezavivaxuxorubibigaxigix.pdf
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/75930481982.pdf
    • https://copacndg.com/images/uploads/files/duvor.pdf
    • http://bestbelly.org/content/files/files/miravutejela.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_off0000c4f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F2 16792 bytes
font_01_sfnt_off0000dd09.bin
106761970a3f0ee71b2e379f3a6b145cba5174ad4f0febfce47e30401c30f271		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 11132 bytes
font_02_sfnt_off0000f69c.bin
a1157343fd27aeccbbf7d4b59cc7d44784cebdf40f1d4e944712c0d466014064		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF69C 16332 bytes

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