Malicious PDF — malware analysis report

Static analysis result for SHA-256 c830935431706fc9…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 08:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8f830bd66c1f999612da8a578f2173b SHA-1: d14ef53a91f7ff7da86b71fc51c2ee0c71ef5ac4 SHA-256: c830935431706fc99a76163949c71d3a263ed69ba1712b2863f85a91e0f511c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the heuristic firings indicate an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/14450561928.pdf In PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/26853668064.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/togoperuve.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/66075756500.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/65161004713.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/siwasosud.pdfIn PDF document text
    • http://potlista.com/file/files/13325787275.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/89921828284.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db0964357b---48930323662.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303c30d09ff---47241959248.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/14174585553.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/nakimerejokowidizalagu.pdfIn PDF document text
    • https://terracell.pt/images/file/pabebafixibinonobunexib.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/xudagedafuvugodiwanu.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/dipoge.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/negakutikegorixaxo.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/31255410514.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/xewamonewotegoze.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/jamipobewobebu.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/20753007146.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/jatuwomivuw.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///2962342645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=music+keyboard+app+for+androidPDF 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_off0000d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD731 17844 bytes
SHA-256: 7555a52b9fdbfdf0da30a353ccb8a81654f75df275e7307256e22b524acb764d
font_01_sfnt_off000105b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 10908 bytes
SHA-256: fb4b8e046530f66c3673b29a8fa278032f3ec5bbb66737ef2239245e21e55806
font_02_sfnt_off00011ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1