Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b3cfffaf05dd47…

MALICIOUS

PDF

103.3 KB Created: 2021-09-12 16:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 54e9d7d4e85c32887ad5d93e552ff26e SHA-1: 2d90d9eee28a447ca78de2b6f67770f5c014899e SHA-256: f0b3cfffaf05dd4777e790b91dc1a4985fd37b66b712646aa741be093b170a8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://jedzenie365.pl/ckfinder/userfiles/files/vofiledogopijid.pdf In PDF document text
    • https://hk-delight.com/UploadFiles/file/vubaruvesanumobalono.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/75234915017.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/23438047541.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/77873014767.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/13424459064.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/91083086443.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/2664593283.pdfIn PDF document text
    • http://olympusflights.com/files/files/68613854296.pdfIn PDF document text
    • http://huefpdf.org/upload/file/84200374468.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/6141422302.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/40223814116.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/fegasiriwuvek.pdfIn PDF document text
    • http://melabo.com/upload/files/81804428805.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/96991915085.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/75313156190.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/wulosanajuvubabe.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/72848574584.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/38694629475.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/003fca3a801a01ded047f6b3b136ae87/14644611609.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210909231202.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/vokotoragusifevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=o+sound+words+for+kindergartenPDF 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_off00012e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8C 18692 bytes
SHA-256: fe1bd64e87206a3ba63e2156fa313c592000f1563e257935b5b862851540ae25
font_01_sfnt_off00015e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E8A 10784 bytes
SHA-256: 5c144ff003f63be81333e4707b385b4672731b9cb309126fbec7cd0b0bcb407d
font_02_sfnt_off00017769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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