Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c59f349746f359…

MALICIOUS

PDF

69.2 KB Created: 2021-09-11 19:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e51ec1ab183f1963a98bb26fd5375ec SHA-1: ec4a4dd9e6abb3d3a784d4ecd50e6ca33a413f00 SHA-256: 28c59f349746f359c9c92b662f8a562aae1cefac78285ae58e4097330f4b13a3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable link, a common tactic to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b9f60cfc2---renokadetikarumufusatuxe.pdf In PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/68990645856.pdfIn PDF document text
    • http://cutskytools.com/d/files/zenevojivunawelibum.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/52296963618.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/purorejokopupodaj.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/70351460255.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/33858906563.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/47971591701.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/vawexopotapilabowel.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/3246423044.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/3652290179.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e3c32b25bdf48b1e01d9bfd85cd870df/36726526830.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/jakunubaxajarilimegu.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/tenadimibudazubara.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/32124440821.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/jakojew.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/25975450779.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090602232710.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/44612327237.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/75305432846.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/66050268454.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/fifirusotamevuratoxap.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/dewoxifuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+block+hidden+numbers+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_off0000b2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E8 11044 bytes
SHA-256: 6181418d050218bbc1936387de6e122546d3d458cd6ed2f76652382d68521251
font_01_sfnt_off0000cc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6E 14108 bytes
SHA-256: 34d6c012199e8484bdab63d63392612f84a45b6084712fe49baf99118fdecf93
font_02_sfnt_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1