Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2608e83b305af0…

MALICIOUS

PDF

70.4 KB Created: 2021-09-24 15:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fdcb64f7e03337bd251d5dcc0f203706 SHA-1: 244251b1073b2d6f794a0de1cb5536d702041930 SHA-256: ef2608e83b305af045702cd088049ba04b8f9e79d0c353773c381b777d367f3c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown-reputation URLs strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file, indicating it is likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=android+download+sdk+manager PDF link annotation
    • https://prtl.pl/userfiles/file/40804572507.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/55189952148.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/94829226028.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/65698265143.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/tuladabubolusogilujumota.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/wubukitisetavepuzi.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae22ba76d3390b525eec4d7ab16158e0/bijuxelizulerowod.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/risufupidivamufupun.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/93790402013.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/32901946342.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/27804846114.pdfIn PDF document text
    • https://0900107678.com/upload/file/4290207474.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91632702963.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/29470630709.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/77417533780.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/98843672700.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/jefimudugoxitowefavo.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/60481151332.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/70799670699.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/rijezipodejixatusut.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/74db4b111c435ce695e3983367b0bd9f/3456167765.pdfIn PDF document text
    • http://www.terresdescaraibes.fr/file/fupidamifutuvemiv.pdfIn PDF document text
    • http://minhanh.com/files/takesezanazabexeza.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_off0000b30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1F 16056 bytes
SHA-256: f1288a67a6b726d713cece2ace1787fdb3bfb22937987ca5ea67753d2cc1b440
font_02_sfnt_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 10652 bytes
SHA-256: 5643252f53989c0f5bfba6fef336db139fd5a13e5f7efb20adc59e269a6408dc