Malicious PDF — malware analysis report

Static analysis result for SHA-256 264a440ebf990e30…

MALICIOUS

PDF

97.8 KB Created: 2021-09-14 11:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 29907929fe113d91f72b60c898bcab84 SHA-1: 4dd76c528c2bfbdd794704d4dfedeaae7129c4db SHA-256: 264a440ebf990e306b0fa4b190655e40869e394faac1d6b79bba4960418278ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to form a link farm. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or to download further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://queure.ru/uplcv?utm_term=how+can+i+transfer+apps+to+my+sd+card PDF link annotation
    • http://ateliergermain.net/sites/default/files/file/41352991495.pdfIn PDF document text
    • https://angkagenap.com/contents/files/fizufo.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/7576319367.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/rudibemaxigevebuva.pdfIn PDF document text
    • https://pellevah.com/upload/files/34044984193.pdfIn PDF document text
    • https://glozor.com/userfiles/file/67967132757.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/97337263527.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/lejozijavusakinup.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/63934312467.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/zulaj.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109092148309159.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/64899027859.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/guzojepadawi.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/95582247689.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613e201fee8e2---89641555524.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/zakijodepiwozo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/309d6641cf5c8ec7f46e45a510cad411/52773819660.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/kezufiwilagafemosaxek.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/12581635155.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/3817314176.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/xakavufumor.pdfIn PDF document text
    • https://digireg.gr/upload/bipigovuduzifomonu.pdfIn PDF document text
    • http://sro52.ru/uploads/files/duvunosi.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/81613206430.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/kuvowugusuzagekasivu.pdfIn PDF document text
    • 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_off00011730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 10928 bytes
SHA-256: 044bbe30911419c2f4d5f10b372ac5505cba630505815cc0f0f59a3ca3a86901
font_01_sfnt_off00013089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13089 18924 bytes
SHA-256: 057126a436a8e75f07229661665fbbb1025c8c4e1cc5beaa892bf0afe7ad48d1
font_02_sfnt_off0001619b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1619B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1