Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84b81d997fc8c02…

MALICIOUS

PDF

104.3 KB Created: 2021-03-12 05:50:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e3f060c995808f3fd81405850a74f145 SHA-1: 85274cf42b2d49f8e98d73870ed8158a461a665a SHA-256: f84b81d997fc8c0285a11ad228471927ff63b9bc8f074c6c3021f4af2d508ae5
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to external PDF files, indicating a link farm likely used for SEO manipulation or to distribute malicious content. The presence of a link to a known malicious redirector and the ML classifier's high confidence score further support its malicious nature. No scripts were extracted, but the structure and embedded URLs strongly suggest a phishing or content distribution scheme.

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
  • 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://crophysi.ru/wix?keyword=boy+scouts+of+the+philippines+manual+pdf In PDF document text
    • https://mesupajediruz.weebly.com/uploads/1/3/6/0/136051454/fasujenoniza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366327/normal_5fdff84d62d3b.pdfIn PDF document text
    • https://salubekera.weebly.com/uploads/1/3/2/7/132740515/77b527af41f33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449605/normal_5fe1869d5f99a.pdfIn PDF document text
    • https://vojesegavosoza.weebly.com/uploads/1/3/0/8/130813146/nivowozuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_6022a15bb0baa.pdfIn PDF document text
    • https://piwaxiru.weebly.com/uploads/1/3/4/8/134882920/ravijelewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_6022c67e84c46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403537/normal_600662f3c2c07.pdfIn PDF document text
    • https://ziwedalonom.weebly.com/uploads/1/3/5/3/135325023/mugufajujox_vuxodabeteb_voboguvozugis.pdfIn PDF document text
    • https://wisokovunali.weebly.com/uploads/1/3/6/0/136051549/werajorud-pekegogesog-ridoxatir-zudeluvowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527237/normal_603f4fa4ee9ff.pdfIn PDF document text
    • https://mokugutareno.weebly.com/uploads/1/3/1/6/131606089/lukena.pdfIn PDF document text
    • http://dadivasim.sportsontheweb.net/xeximavibu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389084/normal_601116b5b5138.pdfIn PDF document text
    • https://bajorenurelop.weebly.com/uploads/1/3/0/7/130739037/55638ede1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piwakitidi.onlinewebshop.net/how_to_apply_rudiments_on_drums.pdfIn PDF document text
    • http://wopojofa.atwebpages.com/4250317240.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_off00015ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE4 5452 bytes
SHA-256: a3c14203d38f5c940f4b8c5f0b3e2bd1e020ebe56c2bd90289856e3b6296ab05
font_01_sfnt_off0001715b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1715B 10096 bytes
SHA-256: d5b3183c2a997dc6e908534205b806e52197b8dc47eeb00d19fe473baec3124c

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