Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dfaadb0f98283e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-20 03:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: edb6db840564436cec64155bbcc157da SHA-1: faa52be1aa7d04d0090f605bf5998d0df585de28 SHA-256: b9dfaadb0f98283edb59840ed0a9aed9adda26a35d1d0cc85448e35c3d930d3e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it is a link farm on disposable hosting. The embedded URLs, despite some being marked benign, point towards a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and URL patterns suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://rudolphi.nu/userfiles/file/kemokojetewidada.pdf In PDF document text
    • http://dmychadla.eu/UserFiles/File/97816619339.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/nijobibunuwulumidatilizex.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/fuselive.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/namarogitosol.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/gagegofizobojevezotuvi.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/81817275878.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/pidubexagujikukatejas.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/28127172981.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/jopilufixewufumejo.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/febivekirijefot.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/23560074352.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/39471347102.pdfIn PDF document text
    • http://normel.org/files/upload/file/66672390073.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/dizubolenuzolumi.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/kesonusisujilukugezebo.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210909184217.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/68dfd906bf3d5849993475df972c7211/kelexugalupos.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/16100646000.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/75676621160.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/68362053159.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142fc3923857---23864044580.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/fetuwef.pdfIn PDF document text
    • http://vlajamo.cz/images/file/37221489040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+send+pdf+in+messenger+using+android+phonePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB2 11076 bytes
SHA-256: 1741ca0e4fc5f9d7b12df18e4c9a1111a5fa7dea6df9ca2fd225f1c3292a819d
font_01_sfnt_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 16596 bytes
SHA-256: 5ccbd69f19cc17666f9f07e5f3fc722273587352f86a069b9e2ed8ba898dc32d
font_02_sfnt_off00010136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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