Malicious PDF — malware analysis report

Static analysis result for SHA-256 848ae0fd06ba8190…

MALICIOUS

PDF

86.9 KB Created: 2021-09-15 20:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12e5e12fef3ea296242d612d084f6c94 SHA-1: c96a0730ea7f17a17f8e1e926549bc852947b832 SHA-256: 848ae0fd06ba81905b7fdd229164305a65f5d3ff5da19ed08e26f88a711136bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially malicious PDF files, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating the PDF is part of a link farm on disposable hosting, likely to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gesema.com/UserFiles/file/23485505210.pdf In PDF document text
    • https://flardochform.se/userfiles/file/59888477392.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/fapofotugoxufujamavadele.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/favavigurixegijuxu.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/sobaze.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/zajugeziwudug.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/zixasurerijorisipozaliret.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/gamarubinelebibaguvazul.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/21294136376.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/89717977749.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/30bra2ktdt0oltsqndq1eh0gs1/70493390598.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/82500996350.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/tuwafufatikalo.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/83366715267.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gsp7aa7katopv6pmk0lnqnlcs7/wafetukurusuvabonob.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/84144723694.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/ragipetixuzupatilomam.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/giripupow.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/welidigilipevo.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/bodotipogafixexifir.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/pufewuretejigepoda.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/vanelor.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/37366870794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+view+ai+files+on+androidPDF 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_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 10492 bytes
SHA-256: 15453f92454ea1195a89613a912bef97298e54c4b8155f6e01769949f88c83f4
font_01_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 18948 bytes
SHA-256: 13a168fd0cb4f17aabb45fcd7da1dda8705d1f4cf708b2d861feca7a23f53043
font_02_sfnt_off00013548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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