Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31450673e4384aa…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 00:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da3565a1eeb662d6662f19730fa20988 SHA-1: 54804e1e4ef61b9dcdbe2769748e350304373465 SHA-256: f31450673e4384aa803c9c0bb804196745c767eeb5a5892fc3338bc5c58be780
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which are hosted on disposable domains, and one heuristic specifically identifies it as a link farm. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://factorycontrolprojects.com/userfiles/file/dedafelavubafejoxaso.pdf In PDF document text
    • http://hueide.com/upload/files/tugazuxumixoran.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/76285799777.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/93411495356.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/kaguvegojulomej.pdfIn PDF document text
    • http://aweibel.com/Photo/file/dekejuzaparojisenifi.pdfIn PDF document text
    • https://ijpdua.com/contents/files/gejamananidap.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/zotujipurilo.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/vukevamezutegikibarur.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/18035968493.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161371c2e9fceb---58513296275.pdfIn PDF document text
    • https://flomogroup.com/upload/files/87460194958.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/23451756918.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7d43abfd8---15488557180.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/95933347889.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/rowaxuvapawagaduxupeda.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/xapilowotu.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/85633502958.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/77382719391.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/53711809078.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/86813308557.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210909052102.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/funojaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sinhala+translation+books+online+readingPDF 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_off0000d6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E8 10832 bytes
SHA-256: 9569edc8d92604a34c88e54121cdd45bb9290438b5829635a41e6cf8a00e9018
font_01_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001079f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 17480 bytes
SHA-256: 09afb7666680750ed360b645364be39d9fc742f16fe7a03c786d2184f6a6142e

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