Malicious PDF — malware analysis report

Static analysis result for SHA-256 df61a213290de66d…

MALICIOUS

PDF

67.8 KB Created: 2021-02-28 03:12:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 10534fdec2cbe05ac34e6a10d76505dc SHA-1: 39db28444d32167fb7b9799c549d307810b903b0 SHA-256: df61a213290de66dc3477c60ac8e61999867e1c4c16cbca2c21e1cef2653f477
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/strik?utm_term=personalised+tale+of+peter+rabbit+book PDF link annotation
    • http://fusitekive.iblogger.org/36130091578.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409801/normal_5ff1246771256.pdfIn PDF document text
    • https://niraxonaweza.weebly.com/uploads/1/3/4/0/134000156/vogarufal_muxekireli.pdfIn PDF document text
    • https://cdn.sqhk.co/nalawanuxa/G0gijh6/don_t_ask_the_monkey.pdfIn PDF document text
    • http://naxovonukile.iblogger.org/adolescence_education_programme_report.pdfIn PDF document text
    • https://venolebibu.weebly.com/uploads/1/3/5/3/135348563/zatoxewitogebonizoge.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/jbFDWih/5579214558.pdfIn PDF document text
    • http://erkutungotu.com/rowaxaniguwemorojetapafedquip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469349/normal_5fe42d0f1fb7b.pdfIn PDF document text
    • https://misamizejip.weebly.com/uploads/1/3/4/3/134348089/ladej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474739/normal_5ff143056757c.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/jjqhhjc/wedding_makeup_salon_app.pdfIn PDF document text
    • https://cdn.sqhk.co/vagizabibo/fI2gjgf/nfl_standings_2018_week_6.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/enviagj/44410223684.pdfIn PDF document text
    • https://zudobusida.weebly.com/uploads/1/3/5/3/135330479/vevozibimu.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/Ghh97jj/27007046967.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/Emgzigm/65579110004.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sukeboragepude.epizy.com/26209510774.pdfIn PDF document text
    • http://tekunobujolid.epizy.com/vanilla_wow_holy_priest_leveling_guide.pdfIn PDF document text
    • http://gasigigi.rf.gd/vunolewopogonukexu.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA57 5240 bytes
SHA-256: d71eb506afd1b49b823b717910c4bfd535520a5772191edded3f3b5331205a85
font_01_sfnt_off0000dc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 11092 bytes
SHA-256: a0670b5ecb62fbc42034750ad21c7ed2dad0981aacce4df713b78eb3294ddffc