Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d830235cecc729…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 19:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4e30b2c4d7ccc9ec0f669a38ccfa86e1 SHA-1: 53200038c3ed2de5c3a6e565ebb3931aa9aebdcb SHA-256: 83d830235cecc729431ab3465096d4412fba60e082ab4b4e8b0357183957574c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URIs, with many pointing to potentially malicious domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the conclusion that this document is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://speedwayinfo.hu/uploads/file/32854648074.pdf In PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f74c3683a---24162859705.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/zedelixoxoxivaxawoniwelat.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090811291483.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/81287571645.pdfIn PDF document text
    • http://artio.pl/files/files/68855463241.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/mujadelole.pdfIn PDF document text
    • https://acmfashion.vn/uploads/files/89474135890.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/zuxizi.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/bugogexarovamoxogonob.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/28131926166.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/56087214148.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/50874838473.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/zusatup.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/xofotugivego.pdfIn PDF document text
    • http://malifer.hu/upload/file/70292993622.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/fuxij.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/78554227537.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/buromaxirukepifij.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/83721895595.pdfIn PDF document text
    • http://teifsepahan.com/files/file/kivunuvojiladozep.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/jexiwizaneja.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109151706244970.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/tuvisemosawamutilani.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/86742912574.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/99611081929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=best+mobile+mmorpg+iosPDF 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_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 17000 bytes
SHA-256: 7a9f33f47e62d85b210ac87a30631d997058be5dbf120849d89cf2016ad93ab5
font_01_sfnt_off00011240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11240 10524 bytes
SHA-256: dfeb656644daeb3e6b18b9dd2e705f429c4321bc97eba27f58667506e0cb61a5
font_02_sfnt_off00012a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1