Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25d96c17b960b72…

MALICIOUS

PDF

66.8 KB Created: 2020-11-23 01:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4804f42a19e6e26c3a618fa1738957f0 SHA-1: 037931b6415fdf5197fc95395142d716aff35fed SHA-256: b25d96c17b960b723a14f9b0d340f3da64228fb7f59043fa5e31f487ec1ba08a
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate a malicious redirector and a link farm, suggesting the document's purpose is to drive traffic to potentially harmful sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://gettraff.ru/123?utm_term=baby+bjorn+mesh+bouncer+manual In PDF document text
    • https://pukadove.weebly.com/uploads/1/3/4/6/134694451/xibub_nojopomo_zuvafidoju_siwavu.pdfIn PDF document text
    • https://pejuloxekipural.weebly.com/uploads/1/3/4/4/134403187/dedad.pdfIn PDF document text
    • https://loneluripovulom.weebly.com/uploads/1/3/4/3/134364014/3dbb7bcbe44226.pdfIn PDF document text
    • https://tidoxanarapora.weebly.com/uploads/1/3/2/7/132710787/tivobobe-welajenaraw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383929/normal_5f91bed6c8e9b.pdfIn PDF document text
    • https://wawurekufa.weebly.com/uploads/1/3/4/3/134322490/55284.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/tometubufimopim/caudate_lobe_vein_drain_into_ivc.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/swede_vegetable_in_usa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c56f9d1f-e9c1-470a-aa3a-fc944116d214/52330575308.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/71080672257.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/10203782901.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/basic_definitions_of_accounting.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/weave_silk_2_online.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_off0000ca85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA85 5408 bytes
SHA-256: 45f3383c13118a10898dcee498508a564d0b0d98207fe3d941fbcb4b470a703a
font_01_sfnt_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 9960 bytes
SHA-256: e1498b08430dd076d8fedf3f4e88a430a055fb3345a6242e5b52c4d5db3b3be4

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