Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf517c0217d4468…

MALICIOUS

PDF

84.6 KB Created: 2021-09-23 16:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5deb3be0ad38479bb3b3585a2ed2da73 SHA-1: f4c230c35ba32e0ead912dd3b4c9d27e9c483fa3 SHA-256: eaf517c0217d4468512428ba26e9a4745ee1c1f0fe464972576a3e66d4836830
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and appear to form a link farm, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms this structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://flairpens.ru/uploads/files/31399533938.pdf In PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/wofusajarediluzalafesirip.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/37474801059.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/sifalajukuduranuv.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/jimudidanev.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3b024c1cf670e9870e010ec4f678e74f/metiwevodebiz.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/60755741825.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/mapiwijiwakiraguj.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/gedodonelimad.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/75477960000.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/dabez.pdfIn PDF document text
    • http://edmunditemissions.aboutgiving.net/sites/default/files/editor/file/madutirigonemejed.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/47321399065.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/sixodefebamojapawevakeve.pdfIn PDF document text
    • http://vo23.ru/upload/file/10830758495.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/68419110048.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f52c4821b7---80064160534.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/69617005070.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/26805025223.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/nabuzobajoguvilinujomeme.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/kubuvixezeresixude.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/dajebuvo.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/lorerodanoturabifoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=harry+potter+stephen+fry+downloadPDF 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_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 10692 bytes
SHA-256: bd387a5cf14f23a94e1704e600da795867e2ef77e9f5646b49d6724d1bd67205
font_02_sfnt_off000114c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C1 18652 bytes
SHA-256: dbfa828a310f6bb87f8c9b8afd964520cd3b0f448fc0ff8ad0a4bf85005b1800