Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10d35b03c2a90ec…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 12:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 22eb12f293498160198b0ac460435c31 SHA-1: 6c41f6345a6b796588dc2c8eeb11b5614eabde6f SHA-256: d10d35b03c2a90ecde9ac4c111597b8af21d5435b2b56ac9d2d77f3bf8343b51
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to a link farm, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a potential phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pekingtogo.com/uploads/files/11011767769.pdf In PDF document text
    • http://abwingsde.com/uploads/files/80485083579.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/14002492361.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/7541723169.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/38540555502.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/degatake.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/35689785528.pdfIn PDF document text
    • https://baglab.pl/galeria/file/fenulidikimeluz.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/nesunulafefewut.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/logefoluwowaga.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/tifakolugit.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/16492506364.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/77451171297.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/majajibejezotuto.pdfIn PDF document text
    • https://kratky.eu/files/file/84033622493.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/96862212877.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d7bec1d5---88595281612.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/zibiwuwikixa.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/78803031763.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/tovevezelitazafif.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/18818323461.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/pudomadobazakonaxes.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/68808556964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=3+letter+word+that+starts+with+cPDF 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_off0000d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 18652 bytes
SHA-256: 6f4ab30f9be44d23ab5299dd9f792cd37121c21e0208488a0d29ba64b00bae27
font_01_sfnt_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAD 10524 bytes
SHA-256: 69516966186b1db859eb50d6d79662a379ba0c64c33077438a70862a83a699dd

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