Malicious PDF — malware analysis report

Static analysis result for SHA-256 36869e00888af381…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 05:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fd50ff8e4921a0e55a0472a502401b5 SHA-1: b6615586d4dd40a98cf7170eb7de6fa92b071745 SHA-256: 36869e00888af3819dc6a1bc0336e756cd81de0910267853dc7d17e010ce817c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URI references. The PDF contains numerous links to disposable domains, suggesting a phishing or link-farming operation. The embedded JavaScript likely facilitates the redirection to these external URLs, which are characteristic of phishing lures or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://catamma.ru/uplcv?utm_term=hagonoy+postal+code
    • https://mimpi1pusat.com/contents/files/73150393181.pdf
    • https://bobecoingatlan.com/uploads/editor/file/muvikoboj.pdf
    • https://vsetinrally.cz/userfiles/file/bukijowutazenuros.pdf
    • https://kolegium.inaheart.org/upload/files/11195939839.pdf
    • https://jdconstinc.com/ckfinder/userfiles/files/71521841366.pdf
    • https://singlespeed-switzerland.ch/userfiles/files/nusemakabefubalar.pdf
    • https://lemarko.com/userfiles/file/79792721334.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/tulegagezi.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613dced8092ae---varujenowizoge.pdf
    • https://falconshipping-uae.com/userfiles/files/welomorisij.pdf
    • http://ministryofrum.com/memlogos/file/88038163270.pdf
    • http://www.ambatownship.com/ckfinder/userfiles/files/gomekagepijixegit.pdf
    • http://artikos.pl/userfiles/file/pezabej.pdf
    • http://vititanon.com/user_img/files/85755671161.pdf
    • http://archpiudue.com/userfiles/files/mikimowerukosek.pdf
    • https://acrgroup.nl/userfiles/file/tawumusekor.pdf
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210901_213657.pdf
    • http://gloria-eurex.com/images/blog/file/fizoxu.pdf
    • http://zawodydrwali.pl/app/webroot/userfiles/file/fafigatodizukokogu.pdf
    • http://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/30183938608.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/65007914589.pdf
    • https://namhunglogistic.vn/site/files/72105984801.pdf
    • http://linpus.com/app/webroot/userfiles/files/tuzizus.pdf
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/4942791855.pdf
    • http://longtra.vn/userfiles/file/27011374954.pdf
    • http://alpinedelhi.com/userfiles/files/81004194762.pdf
    • http://vidol.nl/userfiles/file/65377157087.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_off0000ddf0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 16792 bytes
font_01_sfnt_off0000f602.bin
85eb2fb099573ad83c37d053477c258c335fa451320e1dcee67ce431a538887b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 17796 bytes
font_02_sfnt_off00012479.bin
899e27552e53e34c0240ceefbd4d65c2c1d686fa83ab59260272cb044f480160		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12479 10600 bytes

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