Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7256d3a95bd326c…

MALICIOUS

PDF

75.7 KB Created: 2021-02-28 04:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 371f1694f82923e8c19d1c11ebc5b5a5 SHA-1: f5e73b22b8280b429f422bcbf32cafa35ffa9173 SHA-256: f7256d3a95bd326ca3c589e79cbcb53b95d41255ccc3098a529125f6bc73e625
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 designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

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://xezojetit.ru/123?utm_term=how+much+is+one+percent+of+amazon+worth PDF link annotation
    • http://vezerfa.xyz/limelight_networks_earnings_reportaxs9e.pdfIn PDF document text
    • https://cdn.sqhk.co/mixenezir/jgfhexs/63800651033.pdfIn PDF document text
    • https://xorizelipuv.weebly.com/uploads/1/3/1/6/131637744/zapobamozonudufos.pdfIn PDF document text
    • http://felidefewipikig.22web.org/hdfc_chillr_app.pdfIn PDF document text
    • http://a1metromovers.com/346634725647y95a.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/hhSt3dl/75614538751.pdfIn PDF document text
    • https://cdn.sqhk.co/pugipepa/Mgcieig/lemon_bundt_cake_recipes_with_pudding.pdfIn PDF document text
    • https://cdn.sqhk.co/sowanigog/h9RzF9J/banini.pdfIn PDF document text
    • https://cdn.sqhk.co/wizevomorofe/IZahbyL/kask_shot_furious_squad.pdfIn PDF document text
    • https://sedonefuwetupo.weebly.com/uploads/1/3/4/6/134669082/lugatikuruxom.pdfIn PDF document text
    • https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/ronepozi_biwobojako_tikusom_rosubepilo.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/B1jdjja/playroom_furniture_for_adults.pdfIn PDF document text
    • http://fuwimel.22web.org/91897457988.pdfIn PDF document text
    • https://degadita.weebly.com/uploads/1/3/5/9/135965793/ponite.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gagisejokunego.rf.gd/jebowi.pdfIn PDF document text
    • http://timarumakigojo.rf.gd/nepewuzo.pdfIn PDF document text
    • http://dafoxep.rf.gd/19975060265.pdfIn PDF document text
    • http://xetobagog.rf.gd/lirr_train_schedule_huntington_to_penn_station.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_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 5328 bytes
SHA-256: 4ce0f774eb3db869ef7cced4e01b11527ecb348b28a378c7dde7056e5b65d10d
font_01_sfnt_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 11176 bytes
SHA-256: 56f5cfb8a4fd193e55f638f09017128297baa92a7de099a981e1a58d168d24d4

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