Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3addba51439da7…

MALICIOUS

PDF

80.9 KB Created: 2021-06-01 23:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: af4eed5ef371b13a9a679071beb9d2e9 SHA-1: 653f3938d9ab3e9281f23206cd493b420d00f063 SHA-256: 8b3addba51439da73681f67e7aa9b8ef0fb07bcb96a26581dbb6f724de965881
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, indicating a link farm or phishing operation. The presence of embedded URLs and the PDF structure suggest it's designed to redirect users to malicious content, potentially for SEO manipulation or to host phishing pages.

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://jacksth.ru/123?utm_term=iupac+nomenclature+practice+exercises+with+answers PDF link annotation
    • https://dubamuxurel.weebly.com/uploads/1/3/4/4/134463085/9123778.pdfIn PDF document text
    • https://gojinatunipow.weebly.com/uploads/1/3/4/5/134582877/d4e596786ceac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380883/normal_5ffefffe4d809.pdfIn PDF document text
    • https://pabimoju.weebly.com/uploads/1/3/3/9/133997489/nusupije_padir_xomawukuv.pdfIn PDF document text
    • https://sadavixiji.weebly.com/uploads/1/3/5/3/135333995/95a47.pdfIn PDF document text
    • https://lenalavawin.weebly.com/uploads/1/3/4/7/134732275/bijopigo.pdfIn PDF document text
    • https://kelonefak.weebly.com/uploads/1/3/2/6/132683111/347373.pdfIn PDF document text
    • https://tanaxafim.weebly.com/uploads/1/3/4/5/134501517/loxeju-pasamiwovosoke-zowixukoj-vifiwe.pdfIn PDF document text
    • https://zinikigi.weebly.com/uploads/1/3/1/4/131453967/rirugajit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380699/normal_605f54b9c2a6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416302/normal_6064c82fc1d82.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/cbe3f73a-afd6-410c-b47d-878b24b8a64a/linear_isoquant_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad28a0cb-4a7e-455a-9be9-bab45666456f/64613114929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62415ef0-4c21-4471-a892-313e72d582e2/marvin_rausand_system_reliability_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b06e448d-2642-4b1e-881e-c1ece0e05b18/english_placement_test_for_teachers.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_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 5272 bytes
SHA-256: b3da62b349ed7801bc8681f8bbbcdca2255ae2e3f28d2d47338706a7fa0839f7
font_01_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 11372 bytes
SHA-256: 4adf132ce041c91c0ad656268d9d7903ba61b5c1fac4e837265ad718b5d47817

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