Malicious PDF — malware analysis report

Static analysis result for SHA-256 6214e209ed951dc9…

MALICIOUS

PDF

67.4 KB Created: 2021-02-15 17:50:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ba3f16cfe995ba7317dbdbd9ade980b2 SHA-1: 4d39204b70dc3eea8f97d24594f4d78d3a3bf129 SHA-256: 6214e209ed951dc90784480291f6380d2393f76bfa2b17a2025cf81134f0bae1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One such link is https://baarspo.ru/strik, which is likely the primary destination. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body is heavily obfuscated and contains metadata related to wkhtmltopdf, suggesting it was programmatically generated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://baarspo.ru/strik?utm_term=all+over+but+the+shouting+meaning PDF link annotation
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/pezijafom.pdfIn PDF document text
    • https://danaguvofuboxi.weebly.com/uploads/1/3/5/4/135401293/rebisonuxunov_nopisogidadojet_zujibibal_nalirem.pdfIn PDF document text
    • https://kuginipa.weebly.com/uploads/1/3/4/8/134853520/lovorovo.pdfIn PDF document text
    • https://miwunogix.weebly.com/uploads/1/3/2/8/132814940/xixuzugarozu_rijozas_wizabuvumufeju_wamiro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381976/normal_5ff57b0c70563.pdfIn PDF document text
    • https://zatuduxe.weebly.com/uploads/1/3/4/5/134595584/5973307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382614/normal_6019a22e84a81.pdfIn PDF document text
    • https://vukojudal.weebly.com/uploads/1/3/5/3/135317211/lojip_supokanasinuk_fufexaja_winalizixase.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zoruvalumupubi.rf.gd/famavusimibodaxebuzano.pdfIn PDF document text
    • http://levuvov.epizy.com/nizelawapewununufux.pdfIn PDF document text
    • http://jubalagifagusop.epizy.com/budget_vs_actual_chart_template.pdfIn PDF document text
    • http://wemikovovafebo.epizy.com/36162376545.pdfIn PDF document text
    • http://fupoberisaluz.rf.gd/72699925483.pdfIn PDF document text
    • http://lagadasisipas.rf.gd/chevrolet_cruze_2012_repair_manual.pdfIn PDF document text
    • http://marobow.epizy.com/facebook_messenger_app_latest_version.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_off0000c9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A6 5288 bytes
SHA-256: 5df2765ac8415ccd72fded14bce8df84f01f259eb4a0bcddedcc964bb413d55b
font_01_sfnt_off0000db7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7D 10820 bytes
SHA-256: d5fd874726917d53986c32ec26ff49ab82eafa007c255e721ef8d9e3d281f860

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