Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75239a3cb72f27f…

MALICIOUS

PDF

85.9 KB Created: 2021-09-17 06:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9fdacfc8db14c918103673bb1343a35c SHA-1: e9362df12503c82c4526d8eda3f6e4661c10fd71 SHA-256: b75239a3cb72f27fa150580c0ad460e63f9ae0ce898066473fda6229d2684a0c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating suspicious activity. The PDF contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The `utm_term` parameter in one URL indicates a potential lure for a 'fake calculator app'. No scripts were extracted, but the nature of the embedded links and the PDF structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://wastran.ru/uplcv?utm_term=fake+calculator+app+android PDF link annotation
    • http://ng-sons.com/userfiles/file/fusoru.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/zudosebarerimanogik.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/13283006635.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090907361050.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/poxifijakevuv.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/77811597260.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/bejedexe.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/pisajasagogufav.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/weguvowaseguzobevofes.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210906172248.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/falulexisofupaj.pdfIn PDF document text
    • http://93564497.com/userfiles/21523087722.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18702895701.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/borugarekalulosutisonu.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/57333173709.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/78315685253.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/56124131638.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/jazotajekajorefer.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/xevinutavafefave.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/86965112980.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132beaff3b69---68717971296.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/4332044454.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/pesofejuvapugilezoza.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/buzenumixi.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/fimapodipopunagujideja.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/sivamefevonenilufifojuve.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/352188631.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/33160654007.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_off0000eddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 17180 bytes
SHA-256: f91f27a4f5b9e0f4170ffbe4d8d98b8ad234a3ceb3d630e1889162ed2029c61b
font_01_sfnt_off00011a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001324e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324E 10508 bytes
SHA-256: 57438ed3fd362fa27bab7947866b87fb490a6b3272893a98ce89a5ce50b5c6bc