Malicious PDF — malware analysis report

Static analysis result for SHA-256 7beca93a74df3326…

MALICIOUS

PDF

76.3 KB Created: 2020-12-27 09:07:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 04553d564fed327a124357e75564333b SHA-1: b3b25e589c52823bfe4e9045cc6773dcffd340e4 SHA-256: 7beca93a74df3326fc3ea274c36b65cee9727a7a16762364570b1ee819f25c3b
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or known malicious redirectors. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The primary function appears to be directing users to potentially harmful external content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=fruit+pop+tarts In PDF document text
    • https://zuxubemusaf.weebly.com/uploads/1/3/1/4/131453996/roxukek_gatizi_wotuzakeri.pdfIn PDF document text
    • https://cdn.sqhk.co/disidudi/hPihf60/ranking_mejores_arcades.pdfIn PDF document text
    • https://fotizewuzawefuv.weebly.com/uploads/1/3/4/6/134668380/9379246.pdfIn PDF document text
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/9838718.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/MgijbVQ/saviguxozovexagududul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424997/normal_5fa76e6e6facf.pdfIn PDF document text
    • https://wubabenababi.weebly.com/uploads/1/3/4/4/134432193/mivekudota.pdfIn PDF document text
    • https://cdn.sqhk.co/salenasova/hgdjahj/zoxukunonof.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/igghc9G/head_soccer_uefa_champions_league_2014-_15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426815/normal_5fdb8d3da8c59.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/diwudalemedezuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/58d049d0-4824-4db1-9877-8902215ef4b5/8390992604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06f426e0-94af-4398-b090-3242cdb41bff/gelamevobu.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_off0000e93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93F 4736 bytes
SHA-256: c1446a73cb729c2f0af476f93bab0a12bafa392757295dc4ac6f67880381ceff
font_01_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 13108 bytes
SHA-256: a44c45ca9e87955f02e5a8cc478014049a2aeed2d22624b9b8664004dd02cbc4

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