Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e062a51f85d5a4…

MALICIOUS

PDF

94.7 KB Created: 2021-09-16 16:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61f71d894df183a50a55790f6cff84f1 SHA-1: 65d0a0da2719523481d9f87a78c92af163ec6d95 SHA-256: 49e062a51f85d5a4b403cfcb7342959d100a9af88f3bd555b47620bd7e458b09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the ML classification indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/pagexilesepikom.pdf In PDF document text
    • https://viettrungson.com/media/Files/65662173073.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/9848342958.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/kegog.pdfIn PDF document text
    • https://maviet.vn/upload/files/xisas.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/84031345023.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/96008553023.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/33818924282.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/85033078248.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8d1e4dee---pokir.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/84823584846.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/74610091219.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/6197426250.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/motajutabadade.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0617210301609b541eaedf5e0c92eb44/jowibewuxuxuro.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/68544833711.pdfIn PDF document text
    • http://unibox.lv/files/text/kabexibap.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/ditomajilelox.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/6224950135.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/43539751750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=basketball+stars+unblockedPDF 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_off0001031f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 10656 bytes
SHA-256: 8b44dc8f398b368eef07e1241bdcb2a43101d31547c8a57f15932dde67247246
font_02_sfnt_off000133d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D5 21876 bytes
SHA-256: 1a609b2806dc14573c799d96dfab989a6973200c4cad2dee0b40db2adce5ba92

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