Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6e8e03b7630dc8…

MALICIOUS

PDF

78.9 KB Created: 2021-09-12 16:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4d07cdf7654b1836814ec39f23396e04 SHA-1: f9131c16ce0948d85b404558803a8362b5d3cf8f SHA-256: 9b6e8e03b7630dc8ab1a833447f2e6703f78a4542dd8ebcae87d0bebee792b19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to trick users into visiting malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

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 http://vina2002.com/uploads/files/xutafawipukerugimumit.pdf In PDF document text
    • http://syuncyoku.jp/upload/file/12776581866.pdfIn PDF document text
    • http://benly-carson.com/product/files/wusovowunimoxanogetufegi.pdfIn PDF document text
    • http://cabini.it/userfiles/files/80300491030.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/mepufifuwajubebovotibibux.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/mavegaxilijuxozajifojo.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/39051248484.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397b613b51b---76102108346.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/wopejuwewaxefugeri.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/53687829797.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/59528961394.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///25176713546.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/luvoda.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/divutizojejomenagubunu.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/wozuxutofejerububojuru.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/rapivakigewuf.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210910221053418.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/12779885105.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/75451394473.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/fewanoruvabonojix.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/11201003155.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/77723461389.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/xutedidatejeruwax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=o+brother+where+art+thou+full+movie+downloadPDF 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_off0000ce8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8B 17792 bytes
SHA-256: 3973974e2769776da4443d4b1cc7c9d6344a94a66a83e0a1b5dbb7adbd00bf41
font_01_sfnt_off0000fc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B5 10868 bytes
SHA-256: bf63c7e250c9930a81478b4239039fbbc25fb712010b206ae86e2c88cd3e800b

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