Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a285a372a7c934a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-24 01:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fae7d9e37a7ec0ecec90c980d3392b67 SHA-1: 602417a97e2506c010945fd96cf01321d6fe7e46 SHA-256: 0a285a372a7c934aff6a24b12c3077f67a8877a0e712724bcd2e2dc2665f5326
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URIs pointing to potentially malicious domains, suggesting a phishing or scam lure. The PDF structure and embedded URLs indicate an attempt to redirect users to external content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://synerhu.ru/uplcv?utm_term=c%23+show+pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/49567229938.pdf
    • https://invest.pl/userfiles/file/23504096161.pdf
    • http://davcpundri.com/css/file/lakepufa.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/44594363572.pdf
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/xujoxetusitewiwivuzaxipu.pdf
    • http://duancanhotot.com/upload/files/pupudap.pdf
    • https://jotekonybakterium.hu/userfiles/files/jojupumevaverowo.pdf
    • https://bilegt.mn/userfiles/files/52510053024.pdf
    • https://kermanrooz.com/img/files/25126056464.pdf
    • http://jarauwerdaenzn.nl/userfiles/file/13638406680.pdf
    • http://ergakiland.ru/files/files/71440947243.pdf
    • https://galerie-louise.be/userfiles/files/34846234026.pdf
    • https://westhygiene.hu/editor_up/5396802315.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e33718938---maxagoxifukokofewadipabot.pdf
    • http://etasystem.net/userfiles/files/81129648237.pdf
    • http://co-mit.com/uploads/files/xegodu.pdf
    • https://rent-1.es/ckfinder/userfiles/files/fadabo.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3052707c33390b27091e43dc8e0df7a/76935627009.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/zexube.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/4612395196137ed582fc8f.pdf
    • http://kaitosushisb.com/uploads/files/48903535384.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_off0000dc4a.bin
fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 9104 bytes
font_01_sfnt_off0000ef1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 16792 bytes
font_02_sfnt_off0001072d.bin
7436f8abf4d3a018c0c4edb4db87275efaf24eb54af1463d7f75696ee788bfd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1072D 18148 bytes

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