Malicious PDF — malware analysis report

Static analysis result for SHA-256 9915845e8baefb03…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 11:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca789157c9c23ce2f26571a47b07bf8e SHA-1: 84bf4e86c2706b9e783eba55c5eb10d72f2be5cf SHA-256: 9915845e8baefb038f0c4e3ad1f0b04f4c8ca09192ea556a88fab08572cc69c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and one heuristic specifically identified it as a link farm on disposable hosting. While no scripts were directly extracted, the nature of the embedded URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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://sentai.cc/data/file/20210912_041909_198.pdf In PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/27875169688.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/32082059573.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/5qsth3v53178otkmrbv14jrrqg/fagofalugegatisuvalukef.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/feveramemewu.pdfIn PDF document text
    • https://akvaguru.hu/user/file/35648856388.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/gikulenuko.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210901051148799.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/99099934411.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/85994389400.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/35496123708.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/78403143617.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210911193759433633.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/97343777739.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/86843410406.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/gusuduv.pdfIn PDF document text
    • http://ossokahve.com/upload/file/kowatalu.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/tupiritigetiwit.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90056fb9f---lezixaxojorunuzovopiwox.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/gobufomivirorujaxowepu.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/xezakebawutedupizem.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/sifijolofopuzufop.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/rarataximewerozanojuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+app+to+ios+app+converter+onlinePDF 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_off0000e078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE078 17928 bytes
SHA-256: 4c1fefc35c1de51e2e04ddffa5677cad7ca9e476bfdd8c9889db8ff4e090130f
font_01_sfnt_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 10556 bytes
SHA-256: 6ac240689ea4de1423f9cdffc3eb1407dd9f35558edb99e02c7fb1f1c61fb561

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