Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7673cb863984dc…

MALICIOUS

PDF

72.5 KB Created: 2021-09-10 03:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93ccf700eb2d22e2b2fabc0d325a4317 SHA-1: bdaa0401fa886993ffd1b034bef94926f18a73a7 SHA-256: 4e7673cb863984dc66c8d23d5b1c043e6372603ddd1e97aba8851804412a665b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and an ML classifier as malicious. It contains numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=driver+exam+book+pdf PDF link annotation
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/33106951911.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/javuzi.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/rerekafozerasuxi.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/62398682310.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/83077612880.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/busijuxam.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130834625eb0---24738771926.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/57939453556.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/71391633532.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/31511159077.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/66820131534.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/dazunowofuruwit.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139a9abb0731---43884822577.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/bowas.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/14573611814.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/34198507803.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/8698550713.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/pafudadolisu.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/topopuxewibudet.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/25029388202.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/67912575564.pdfIn PDF document text
    • http://fourfoods.com/images/files/53512473112.pdfIn PDF document text
    • https://kultmotor.hu/images/files/vutoxos.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/ripokobepedikakopat.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/velesa.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_off0000ba78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA78 16332 bytes
SHA-256: 62121d7a4a2e0952f2e38b4c96e014705a8a16183d4213c97ac9edcbdb4f06de
font_01_sfnt_off0000e47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 10644 bytes
SHA-256: 84ec819ec6871d44a9db883c24a3ec7d1adb1174bf0ed88056e5d1ce50dfdbe8

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