Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f3dd26f13cf3c6…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 20:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a23bd0fabcc74ea3ffbbf93e1e5064e4 SHA-1: 1faec939c4c1128be54facbed417a118885b985b SHA-256: b9f3dd26f13cf3c6e1068badd6d328c05a28ba7f7e5fbf61ac563aa28fb24dd4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external URIs, many of which point to link farms on disposable hosting, suggesting a phishing or redirection scheme. The presence of embedded URLs and the overall structure indicate an attempt to lure users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=sequential+circuits+design+pdf PDF link annotation
    • https://xn--fiqa735be48e.com/upload/files/wagofudarafaxetimiteru.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/zawitakopajofezez.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/nexuzaro.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/4777611967.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/bonojatodamo.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/divusepimuwegagotaze.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/308023348.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/81845358169.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/25237324936.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ligugezepi.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/rubofuxamokijazamosuloze.pdfIn PDF document text
    • http://yongqingtech.com/d/files/72411546774.pdfIn PDF document text
    • http://www.agot.pl/upload/file/vozevugixupefapum.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/giwakavilerozobumevowibov.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/wojofegugigesa.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161351f7688843---foxafotapijikededifi.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/jotibilatewexob.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/pupijarutimiwerisaxox.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/78876501403.pdfIn PDF document text
    • http://saktigroup.in/uploads/tabosoleziziwu.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/82242061489.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/vavariva.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/43340805084.pdfIn PDF document text
    • http://nensi.si/upload/file/dufizosaviv.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/murel.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_off0000d0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B8 10996 bytes
SHA-256: ad1f09b92ab21a6188949671a45d7f7d01e0b656c955696f765a34cf651606f5
font_01_sfnt_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 17104 bytes
SHA-256: 0e325b059ac061dc2bae60805834875112d036ad47714b1c18056a49ccefc61d
font_02_sfnt_off0001162f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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