Malicious PDF — malware analysis report

Static analysis result for SHA-256 93eea8b6dc4b5666…

MALICIOUS

PDF

81.7 KB Created: 2021-10-06 22:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5c25431e76edaa02724d7da519358044 SHA-1: 9888f7bdf1cb1ea90c36f53178dbe5ccfc5cdebe SHA-256: 93eea8b6dc4b5666c742ac164a16c4fb219f23eb5c0da90ea9ca211c96c72351
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ketchas.ru/uplcv?utm_term=red+mini+long+haired+dachshund PDF link annotation
    • http://llux.vn/uploads/files/giwopaxivelivafanaruv.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/topofi.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161560d29c854a---38623373160.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/dinosivavabejumoba.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/36411174472.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/mavat.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/duzebojabakefuduxuwuref.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/xokuvepizulurab.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/lemilosifubuwojo.pdfIn PDF document text
    • http://torgoborud.org/images/file/76573813252.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/68874790311.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/lipareva.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/83504606430.pdfIn PDF document text
    • https://creativekids.abcedukacji.pl/web/uploads/files/50592286314.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/50072858457.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/pasuvekonoka.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-13/20210913173713314219.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/gesotoxiwirivevesaxenulu.pdfIn PDF document text
    • https://mandaljeebanking.in/ckfinder/userfiles/files/62976349768.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/pibiwifanufakifajabekov.pdfIn PDF document text
    • https://gulamanis.com/contents/files/36623555966.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/jivugagi.pdfIn PDF document text
    • 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_off0000d58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58F 10864 bytes
SHA-256: 642cebb00ad84d72fe2a909b5bb7cbee6c3f6cffb82e56c25bf7e0ebfd21561e
font_01_sfnt_off0000ee28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 19492 bytes
SHA-256: df3dc75ed20e0dc88667eb88d00ceab282aec40d1f943748f19d99d0f5ee49e1
font_02_sfnt_off00012192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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