Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7969e5d1e5b748…

MALICIOUS

PDF

70.6 KB Created: 2021-09-19 21:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: baafabc93d2cdbd520de23b789ab6778 SHA-1: eaac48d2a963752b8b9ed1499d55dca068b992a0 SHA-256: 1a7969e5d1e5b7488bc6168b7f6ef65140e0b5a7232e0f3bba0aeb55f7105642
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=rich+dad+poor+dad+book+in+telugu+pdf
    • http://puzynowska-kancelaria.com/userfiles/file/musisewet.pdf
    • http://cameralehiep.com/hinhanh_fckeditor/file/nafiwixovelinar.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-9-19/20210919124521408320.pdf
    • http://mrspk.com/ckfinder/userfiles/files/12175264842.pdf
    • http://mecaniquekd.ca/upload/file/80664137980.pdf
    • https://srsatta.com/ckfinder/userfiles/files/zuzuge.pdf
    • http://gsmontaggi.it/userfiles/files/24977483568.pdf
    • http://elandtour.com/FileData/ckfinder/files/20210911_92363EE9144B5108.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d2df4bc9a9c6a3fafa42dd5cb23c543b/vumanamafudomizerir.pdf
    • http://elitvorota.ru/f/file/kokopitexavanetosuw.pdf
    • http://lovesenergy.nl/file/43381768296.pdf
    • http://drironcat.com/images/file/kelotizugareluno.pdf
    • http://hakanhurdacilik.com/userfiles/file/nugexolitulapetekib.pdf
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/kabis.pdf
    • https://byocamacho.com/ckfinder/userfiles/files/lewoz.pdf
    • http://covina.crazyrockinsushi.com/uploads/files/gufekopu.pdf
    • https://gcr.goldcrownresort.com/magazine_files/files/zubixerepepopilomefijelil.pdf
    • http://madveras.com/ckfinder/userfiles/files/60701457709.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/6467183772.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_off0000b38b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB38B 16792 bytes
font_01_sfnt_off0000cb9d.bin
883651c1204f602e0de35168fe6cac35ad866159c5ad66ebbed06d87e38ac442		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9D 15848 bytes
font_02_sfnt_off0000f3b6.bin
227e8a0f224d089e754d3b05043ad8e8d790a03d87725b8f8a62215a033fbb99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 11108 bytes

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