Malicious PDF — malware analysis report

Static analysis result for SHA-256 b804547669f2659a…

MALICIOUS

PDF

73.7 KB Created: 2021-05-17 11:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b00c37426fce7f06eb91980b56d3490f SHA-1: 3718a151c9a87a0ee86b0f6f3b95522f87aa109d SHA-256: b804547669f2659a65fdeb3359cbbf1a0c90607bf15ab33714a38a2ce0e9e36e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, suggesting a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm heuristic indicate the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://zajinet.ru/strik?utm_term=what+products+are+made+in+south+america PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465252/normal_5ff807e42d6b6.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/ifiagee/lightroom_mobile_presets_download_link.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454678/normal_60592cfa57d3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375515/normal_5ffe5abaf2721.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CsqibHb/duzibadufefubonatamarukez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474759/normal_5ffe1b76a9f7d.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/jcnnjhg/drum_machine_online_808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425919/normal_600fb4172c02f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6674166f-eb58-46b1-9d38-a528bc95e02c.filesusr.com/ugd/e38d8e_bc510d766ba1413bb2aab3b5213a81aa.pdf?index=trueIn PDF document text
    • http://telenusu.epizy.com/71364433713.pdfIn PDF document text
    • http://wawanojuvib.rf.gd/atletismo_salto_largo.pdfIn PDF document text
    • http://tipikirobis.rf.gd/97240717672.pdfIn PDF document text
    • http://rosedosoxibi.epizy.com/61172437343.pdfIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_98adee0e8f3b4924adc09aae3c188ae7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxunaf/how_to_convert_degrees_to_radians_examples.pdfIn PDF document text
    • http://kugofabafomozo.epizy.com/wedategutun.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/how_to_change_bushnell_tour_v3_battery.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_off0000e1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C8 5296 bytes
SHA-256: 43290e0844f3c5c332f991c420b0617427bbd09f0eeee26d3ee578010f163bca
font_01_sfnt_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 11432 bytes
SHA-256: d3ff245363c353df7355eade8bdad57f371c88c32bb539242a86d2ed164ebc58

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