Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3fadbd52c08aa6…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 07:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a3a996f899f663a40d2c48c439d8762 SHA-1: ca3ad82c22969855e29df0ba048f483102396815 SHA-256: 8b3fadbd52c08aa6d2cffd6c9f887c845ef6ba7afe85cefd8000a0325dda2d9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded links, many pointing to unknown or potentially malicious domains, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links spread across many domains, a common tactic for evading detection and maximizing reach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://devcons.org/uploads/userfiles/files/kulimoraxorasujilepi.pdf In PDF document text
    • http://gesundezellen.com/neu/userfiles/file/19664396578.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/69000210579.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/41542652116.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/belugoruv.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/72273215133.pdfIn PDF document text
    • http://wohingltd.com/userfiles/62150234690.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/46830211322.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/35472399368.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/kileriru.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/90474205642.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/winubajebesusasutavekaz.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/63584487278.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/82727218268.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///97589444422.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/nezuwezo.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/tubizusuvigamobadoket.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/vifinukasav.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/87807732914.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/37378398774.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/63020247535.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/41151706410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+go+list+of+rare+pokemonPDF 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_off0000d678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 18508 bytes
SHA-256: 47effe5f62f803e03537b7a8de24402d17f1e33aca4afe771fe49b455593009c
font_02_sfnt_off00011e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E25 10792 bytes
SHA-256: d74f30f2b35419ee5f69216cd9a81afe7e851580e125edf9e0779b8c59079f72

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