Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8b10fcf0869ebc…

MALICIOUS

PDF

68.5 KB Created: 2021-01-18 08:54:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dec97a251f5730c798b8f47a5d296c7f SHA-1: 1a781add81f7e9e6535e972a5651cbae91bf4a73 SHA-256: 1f8b10fcf0869ebc83066023c9299989765bdbc42823275aea4a9b0620edeaf1
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'traffnew.ru' suggests an attempt to redirect the user to a potentially malicious website for phishing or malware delivery. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea of a link farm designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://traffnew.ru/wb?keyword=tied%20the%20room%20together%20meaning PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4378152/normal_5fe2b6eb3ac0e.pdfIn PDF document text
    • https://zepaxanodufinek.weebly.com/uploads/1/3/4/4/134455649/7f9f5b5de03fe6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413980/normal_5ff8c18d26bfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368954/normal_5f970e52d77fe.pdfIn PDF document text
    • https://ruritetij.weebly.com/uploads/1/3/4/7/134704214/poboke_buganidepuvi.pdfIn PDF document text
    • https://site-1168140.mozfiles.com/files/1168140/kalumojejaliropovizogita.pdfIn PDF document text
    • https://tusujowifavenag.weebly.com/uploads/1/3/1/4/131453847/460549641fdeca0.pdfIn PDF document text
    • https://site-1177051.mozfiles.com/files/1177051/savujipebufatuvam.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/fgckid6/red_sunflower_seeds_edible.pdfIn PDF document text
    • https://cdn.sqhk.co/zupisopad/X53ibhj/41291715687.pdfIn PDF document text
    • https://site-1172428.mozfiles.com/files/1172428/hierarchy_ppt_template_free.pdfIn PDF document text
    • https://site-1178770.mozfiles.com/files/1178770/mevuluxono.pdfIn PDF document text
    • https://falopizesolirod.weebly.com/uploads/1/3/1/3/131379111/relivosewot.pdfIn PDF document text
    • https://morapunepa.weebly.com/uploads/1/3/1/6/131606469/2847778.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bofake/office_365_outlook_signature_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/chrome_apk_mi_tv.pdfIn PDF document text
    • http://lemujiv.epizy.com/vetikelonuvipi.pdfIn PDF document text
    • http://bajobakokela.epizy.com/simple_agenda_template.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/expense_tracker_excel_template.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_off0000cdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC3 4980 bytes
SHA-256: 393fb8a32de1cd81575bef6cddc0fa5d4aa2e9aba87dc0b9470a5325d6ea7bb9
font_01_sfnt_off0000de82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE82 10836 bytes
SHA-256: 42db04fc78c692756df515d38d3c8c3bb527bf3a768c0181282476ec13002080

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