Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb022647cc9f022…

MALICIOUS

PDF

56.9 KB Created: 2021-09-26 11:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 66260be90a13557018e713fbea231e61 SHA-1: d9a55a4e4899fb2bc78fb6caec325a7e3f3d5d2c SHA-256: 4bb022647cc9f022dd5ba7f0ffef4563c1a48db870c2cabf9f25f41e24682f5a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many of which point to disposable hosting and utilize UTM parameters, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to exploit users through malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7333

Heuristics 4

  • 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
  • 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://philabc.ru/uplcv?utm_term=gnm+nursing+1st+year+books+pdf PDF link annotation
    • https://solelane.com/ckfinder/userfiles/files/geduvigenokinujuzunok.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613510ce1bbe2---fejubijavalagab.pdfIn PDF document text
    • https://superlitefan.com/uploads/files/45210646727.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/51026492546.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/3265715110.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408d60a9974---zubuwulajezasiko.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/8451748017.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/maginaganek.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/78787365644.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/76513634232.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/7022510298.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/86828357521.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/83784111637.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/4866621303.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/28563731756.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/kizuvaxemud.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/dufejuxafedememebezodow.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/bewegukenizejepezivewed.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/62558303678.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/3594681597.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/tasivujaxag.pdfIn PDF document text
    • https://sitarasign.ir/data/file/99075390474.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/64490022443.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC041 11332 bytes
SHA-256: d0039e83ea489cb3715815e237e2a93d3906caf9c0f82ecc163e0c59f456139c

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