Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11fffbe511e060f…

MALICIOUS

PDF

94.4 KB Created: 2021-03-16 09:22:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16b348f4443b463df65b1cfb88641a80 SHA-1: 1b392fff9da8eb0dda768d4a683b8d3f991256af SHA-256: f11fffbe511e060fbf3a077094fe8b3545857cc5a8c04833cfa0091f950cedfa
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, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 https://mezovuduw.ru/strik?utm_term=mary+jane+jacob+email
    • http://itgermany.net/25040552692krrmf.pdf
    • https://cdn-cms.f-static.net/uploads/4452626/normal_6039ec60e1c8b.pdf
    • https://kezakejubeguges.weebly.com/uploads/1/3/4/8/134883255/515643.pdf
    • https://pabibajezejav.weebly.com/uploads/1/3/5/3/135323938/675ca.pdf
    • https://puramekekekiz.weebly.com/uploads/1/3/4/6/134648744/7d7fb42d.pdf
    • http://winfreeiphone.xyz/como_agua_para_chocolate_libro_analisisjmo42.pdf
    • http://maska-respirator.shop/topopud28e0.pdf
    • http://static-start.top/46714718965zht50.pdf
    • http://rankingcoach-seo.com/58047963023uyjoz.pdf
    • http://vabuzunaseridal.iblogger.org/lawenurofizebenelisarebo.pdf
    • https://zuwadakake.weebly.com/uploads/1/3/4/6/134664894/kasep.pdf
    • https://banafovogakake.weebly.com/uploads/1/3/5/3/135326552/zugeboje.pdf
    • https://cdn-cms.f-static.net/uploads/4467936/normal_6032237ec8151.pdf
    • https://tavutafaj.weebly.com/uploads/1/3/1/4/131482866/9500676.pdf
    • https://wijodemarivupi.weebly.com/uploads/1/3/4/8/134861972/af51951.pdf
    • https://xoberaditide.weebly.com/uploads/1/3/4/6/134645794/e2a428fce4891.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fogusevo.epizy.com/flammable_compressed_gas_storage_requirements.pdf
    • http://moxurux.epizy.com/calibre_per_android.pdf
    • http://latujetob.epizy.com/pet_sematary_1989_sister.pdf
    • http://wolaniloko.epizy.com/pifivadetisejelosuvemego.pdf
    • http://lalowarereguwel.epizy.com/43229463064.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013154.bin
3901cd2623c41305bdef891f7d088d22726ca9c2631f7ca1811d900578b215ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13154 5092 bytes
font_01_sfnt_off000142a5.bin
a2ff7c0f5bd84a635303b6c8c0cb7ad673cf9d012c0d958164fdc921efca322f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142A5 12152 bytes

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