Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c4e6bfff02b682…

MALICIOUS

PDF

91.5 KB Created: 2021-09-17 11:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3dca31c632793daf4f5463a3678f6067 SHA-1: ecb44982af89f7043e0a0f582eb6eda9872e05c0 SHA-256: 19c4e6bfff02b682e05d26cc5dc9077b4a0b4d7aa3a779c13c41e801b55ede9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to link farms and disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to redirect users to malicious sites.

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://icareonline.net.au/ckfinder/icare/files/boveviridaguzuxev.pdf In PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/pasufenotojik.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/widugewuxifisaxerunupunas.pdfIn PDF document text
    • http://15881588.com/ckupload/files/26572734120.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/25426790957.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/wajefukimuxufikeberiso.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/ledokemezi.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/jodasiga.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/32842300829.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/rutame.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/33820854898.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/nolotijisoraxufapigi.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/554000755.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/10553589886.pdfIn PDF document text
    • http://ruihuitax.com/files/file/73338163115.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161335be7da8d5---lafewisi.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/14431864493.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/vapanot.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/gerutoluwuwinowopofit.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/bedoparazozanivozaw.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/mewodo.pdfIn PDF document text
    • http://chromoink.com/updates/file/nujolomejuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sun+tv+serial+list+2021PDF 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_off0000febb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 10516 bytes
SHA-256: f150599cec584f6a37f49abbdb7f0f5bfce26c6eaeb054b3c41a36b27957c3d7
font_01_sfnt_off000116f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F05 19232 bytes
SHA-256: adbefb5e76d18d2be4031f1f83b21f11cab8700e5e8e9131284362b5ef95d55c

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