Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29837f3f765ddd5…

MALICIOUS

PDF

75.9 KB Created: 2021-09-09 04:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f734e2ecfda9eb368542631a6ef64f74 SHA-1: 04bfad3850f4e56159e497ee779d694df2a450dc SHA-256: d29837f3f765ddd547a869b0391613dda3b4c05511029617a3fb0a23d3d1aa3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to obscure malicious destinations. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.multigacos.com/admin/uploaded/fck/file/lejizesilukegesizisiv.pdf In PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4a11f9fb---tasalufigagon.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/13864519475.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/polilavitukuwivix.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/91458147695.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/70012863410.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/binalirododel.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/wemedenixat.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/92706606510.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/603878199.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/29335486054.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/96131628020.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/jamewobazibosalekozub.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/maxuzewuzuzoxono.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/3343078189.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/zozav.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/kupogidiminaji.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/54597531727.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/14673250937.pdfIn PDF document text
    • https://blugarden.eu/file/pozelenokedolafofuzox.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210901_14_55_59.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/17805613850.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/vogemafisuwudekavagogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=miss+peregrine+home+for+peculiar+full+movie+free+onlinePDF 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_off0000c399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 17092 bytes
SHA-256: 8d4903622e207b041ca45852ea6c17542b622cf92ccac1b9f6974f169500fa5d
font_02_sfnt_off00010891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 10988 bytes
SHA-256: 52fab173808ca984ae01c15b82cd97ef69c9f5da1b545ab9fa45f11bf1ce95bd