Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a2add2e7bdbd32…

MALICIOUS

PDF

65.5 KB Created: 2020-11-19 02:21:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2765ef83811eb89b2499b3e1bbb90f28 SHA-1: 96213d7cfd1ff7088faeb82de62fadf3a28eb5a9 SHA-256: 61a2add2e7bdbd32e185a6b85991f47a04c9b1eb5a600a8299ae316aa9e8257e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffine.ru/123?utm_term=ps4+apk+download+for+pc PDF link annotation
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/76cc774d0a.pdfIn PDF document text
    • https://dowezepuxaku.weebly.com/uploads/1/3/4/4/134463959/lojifedudikikejetik.pdfIn PDF document text
    • https://jodalutuz.weebly.com/uploads/1/3/4/4/134444421/puwafomotazovunanuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379614/normal_5f8c9dd1cd39d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415739/normal_5f9c7223cca61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383146/normal_5f8e25edc134e.pdfIn PDF document text
    • https://lukafitujukeme.weebly.com/uploads/1/3/3/9/133997152/gupatagelupa.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/9069058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420905/normal_5f988259003e0.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/9730997.pdfIn PDF document text
    • https://vakesefujes.weebly.com/uploads/1/3/0/7/130739027/bubutet_kubijovule_nikizas.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/zasepo/sap_pricing_procedure_display.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/majafitetuwidamevor.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/39194461016.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_off0000c1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CB 5392 bytes
SHA-256: 978368a942a6cb88d5ab6adcdc2d3a77e7c20e0f480c1df97337b7f8c946c1a4
font_01_sfnt_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 10896 bytes
SHA-256: 76879ae32292e4e1ad56af6d0d9c694fd7ddf5ef8ccc3c718a32cf48b42c5908

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