Malicious PDF — malware analysis report

Static analysis result for SHA-256 004e2f13b79f2e84…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 19:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3763181118b3ea09f41dce7972cc5b6b SHA-1: 330811ed4a0dbf23e92798d909715ffa6a6b01bc SHA-256: 004e2f13b79f2e84032e464c6101b03b28e81b298396d3d2a913a18ba86575a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and the presence of many external links point towards an attempt to lure users to external, potentially compromised, sites.

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://deltaguvenlik.net/userfiles/file/fulelazugawujamok.pdf In PDF document text
    • http://restaurant-lyons.fr/userfiles/file/62170899555.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/63833828860.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/gidedojowufo.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/nalakofiruvemixu.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/libini.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/duborupofomaninikazur.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/89408417317.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/pobenivedoviv.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/bunimuf.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/36518465444.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/7550275252.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/sajilez.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/vodefurusilewakag.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/35f1d3271ac1a89c4a42cbd207776197/sawerox.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/98098007899.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161416b9221b8b---83805241069.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/bozixoforalamarijawise.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/12175509989.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/3982206575.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/67375178269.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/ludalamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=kwai+no+bluestacksPDF 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_off0000dd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD27 18132 bytes
SHA-256: 4e2accaadaaa555cb20a3700d9f9bf5c989c27de73d5680ad1aa443859bf880d
font_01_sfnt_off00010c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12463 10532 bytes
SHA-256: 90e517fa6cebe8096970fdcf6f23a6081a52611490b8d7a4271c4a0dd270babe