Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f9fff860b878c7…

MALICIOUS

PDF

67.5 KB Created: 2021-09-27 17:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b051d03bb757b36e592edcea8439148 SHA-1: df00bec54615b459e483cee7e87f5bf52ad6ccd3 SHA-256: 87f9fff860b878c7dc703427f13849b758dc26ce2be01859281d02ee07ac1b0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the heuristics and the URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://archism.ru/uplcv?utm_term=android+auto+stock+app
    • http://local-minicab.com/survey/userfiles/files/povikapepepikitategej.pdf
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/pedatemumituworibisam.pdf
    • https://myphi.biz/nbloom/fckuploads/file/76830037341.pdf
    • http://szilasfood.hu/pic_upload/files/jipujawolisowes.pdf
    • http://ersatzmonitor.de/userfiles/file/22391185352.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/5fd38c1acf4ad6d1e0dad21e6be544e6/junidijulelisogazolubim.pdf
    • http://www.giuseppe.ru/ckfinder/userfiles/files/bofejegozoxujola.pdf
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/ritamamisukixomabasefeg.pdf
    • http://snailgame.ru/upload/files/20210904054816.pdf
    • http://resortcrimea.com/ckfinder/userfiles/files/31601722535.pdf
    • https://alyosserspneed.com/userfiles/files/82083764067.pdf
    • https://suncables.co/images/file/kolerakufupiwi.pdf
    • http://westernmaki.com/uploads/files/mozumikelegijajelapis.pdf
    • http://pelejas.com/IMAGENS/CKFINDER/files/18181848383.pdf
    • https://vinasimex.com/uploads/file/49450679452.pdf
    • https://immsac.pe/sgi_userfiles/userfiles/files/38598540177.pdf
    • http://greenplanetnepal.com/userfiles/file/62020620358.pdf
    • http://wxbeimei.cn/upload/ckimg/files/202109191654185997.pdf
    • https://htcpost.vn/vietpost.vn/img_content/file/bagagiwikavaxotifinamas.pdf
    • http://caerulumpharma.com/upload/files/wirozorerogojurodusiba.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_off0000aa15.bin
7f56891b39833f0fc84f1163b88fae6627c0cad1ce84dd5d620e1476aaa70a5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA15 14980 bytes
font_01_sfnt_off0000cf43.bin
cd879c7d0ec7521c9f347dd236e9e2e9a9e40650fbdf7e2978f6fbe67002bf1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF43 10500 bytes
font_02_sfnt_off0000e751.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 16792 bytes

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