Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85d9e7d58cc6df5…

MALICIOUS

PDF

78.3 KB Created: 2021-09-16 21:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b70f28d3ca83fb6c5206d13aa507c8c8 SHA-1: 5a05bc9692442576ad28e403562912f92b3ff0c5 SHA-256: d85d9e7d58cc6df5c2357421ce57a7af313c30813445e59ebe2a065a9ae7edc2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content hosted on external servers.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=game+roms+for+ppsspp
    • http://petra-koparki.pl/Upload/file/69433703876.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/ganugukasakonikakenotinun.pdf
    • http://ferramentabelleggia.it/public/file/juvegudegefawabixuzut.pdf
    • http://graviroz.hu/ckfinder/userfiles/files/wegedajujol.pdf
    • http://cnhhgj.com/upfiles/userfiles/file/konivat.pdf
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/35604028898.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abea6efc76---jivoworufekite.pdf
    • https://epgeptech.hu/ckfinder/userfiles/files/36921049640.pdf
    • https://artistprasanna.com/userfiles/file/pekozaf.pdf
    • http://studioiulianella.it/userfiles/files/nowugaraxetogikapapezuzal.pdf
    • http://stisk.com/file/65081519294.pdf
    • http://eqletstalk.com/uploads/files/202109151454029532.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210905040501.pdf
    • http://saikunghouse.hk/userfiles/89641550086.pdf
    • http://ride.hu/images/uploads/files/wediputomifo.pdf
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/25239877541.pdf
    • http://iscyber.com/userfiles/files/wogigizolugogivexe.pdf
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/solesugadivezupesevojud.pdf
    • http://vzwsportenmuziek.com/content_docs/nusamidelupokimominifa.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/3kfcd8b06nvsnnivc8p3obbb92/16137675010.pdf
    • http://www.lbtfilm.com/uploads/files/xotep.pdf
    • http://youngthisyear.com/ckfinder/userfiles/files/pisiriwidosomogexim.pdf
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/84900092066.pdf
    • http://dpnovelty.com/upload/files/5545878760.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_off0000cf30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF30 16792 bytes
font_01_sfnt_off0000e747.bin
58f119a59fa0e456b7640cec8d23a96c42257bb0df80e1e4f1ac53187e1ab066		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 10216 bytes
font_02_sfnt_off0000fe38.bin
f8cac2567c70c51e34f0aab7eb042b19ed38c0f103d12b4a87b44d529a3eef7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 17952 bytes

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