Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65d75bc19800a59…

MALICIOUS

PDF

71.3 KB Created: 2020-11-21 07:59:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 296137581954fe4a91ba89401c05a257 SHA-1: db60bc0a8a132109c4110cc4382d32c5e7db4509 SHA-256: c65d75bc19800a597fd8fb7938f514d899f60bd3bccf26d8085d783c408dc9b0
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://trafffe.ru/123?utm_term=voyages+in+english+reviews PDF link annotation
    • https://talupujepanuzan.weebly.com/uploads/1/3/4/5/134595677/9525846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5f9a725d4c194.pdfIn PDF document text
    • https://jewajufigojoxi.weebly.com/uploads/1/3/1/4/131438211/kofotekefoxeduv_xezimi_kasaxura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_5fa09ce1549fe.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/vaxaki_jemevax.pdfIn PDF document text
    • https://rapokivagifo.weebly.com/uploads/1/3/4/3/134338569/webep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5fb6e8bb02940.pdfIn PDF document text
    • https://boduburul.weebly.com/uploads/1/3/4/6/134654649/satedadikiletom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406454/normal_5f9226d6c8098.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wolina/summer_trees_khan_academy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2610cc4e-e846-4fe3-adc3-2da24fd60e80/sumadeken.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baa4d5a6-57ae-4cad-899c-718c3233e4b0/1687081460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/092c6ed4-abb1-4d37-b54f-e2287a8a7371/pailleuse_agram_fs17.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc4cb84f-6233-4754-a130-635547f4dda9/7063997386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67721e03-aa7c-4629-ab41-70011c7d9cc8/96054571610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d2548c3-2e7f-4fa3-8f91-55ce1e360860/56923081274.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE96 4876 bytes
SHA-256: ae528e6170376ecab5c3697bce72707172caf379a91dd00d1ab82ed203afd00b
font_01_sfnt_off0000df1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 10260 bytes
SHA-256: 567a0d781ec08312eb1188bdf382197df2c5a3f2072ab7c40b36e8c9d447f537
font_02_sfnt_off00010241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10241 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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