Malicious PDF — malware analysis report

Static analysis result for SHA-256 13260655069ac473…

MALICIOUS

PDF

70.8 KB Created: 2021-09-21 01:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c8a14afde48776a9cbadc3d01727024 SHA-1: 909262f5ca41cb13ab915b9627c64b2d02e76cc2 SHA-256: 13260655069ac47331e56768d1a48c8d9c2fa382b2a0f8283fe64174a274eabe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high number of distinct hosts and links, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/95145290834.pdf In PDF document text
    • https://helicopterleasingservices.com/userfiles/files/81590611130.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/46127005372.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614603bee6bcf---dezez.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/zaxikadew.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/dorine.pdfIn PDF document text
    • http://unityproductions.com/upload/files/71664607808.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/84505708440.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/78903634741.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/24675982055.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210920133533011.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/1217324864.pdfIn PDF document text
    • http://catwalkexotique.com/userfiles/89750899055.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/xewuwolevidevasu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16135309841695---rabamafozosur.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/61444194817.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/lodunewabokeg.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/38523731206.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/fidike.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6750981305.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/firewojixa.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/repadopowapizivid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=aaa+cash+loan+app+apkPDF 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_off0000b791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB791 10124 bytes
SHA-256: d049e1e42743bfe90299d4232c39daac6587ac6f7ef6f223e3952f29d00e0b00
font_01_sfnt_off0000ce20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE20 15740 bytes
SHA-256: a704da8fb8ba910f7fd81e868d4225fb5ec39add4247b34de382af7b05ceefeb
font_02_sfnt_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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