Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1cdac3e6e6685d…

MALICIOUS

PDF

60.0 KB Created: 2020-11-16 18:25:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1c8dbf448e544842008d80330e2fdd58 SHA-1: d441045119be344aa380c061d40d82d022da0016 SHA-256: be1cdac3e6e6685d2ad1cbc442b77257533634f7a1ae8563e7f57a8ffe3e8f1f
156 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 0.9996

Heuristics 5

  • 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.
  • 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://traffking.ru/123?utm_term=la+valse+de+l%2527amour+sheet+music+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373261/normal_5f93289760823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413227/normal_5fad4c1baae05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5f8ce46d76aa4.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/d5e31677b5c3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476757/normal_5fb262f1654db.pdfIn PDF document text
    • https://wonigebegi.weebly.com/uploads/1/3/1/6/131606731/gurikosugok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373301/normal_5fa60fe381914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382778/normal_5f8e43ccc7e64.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/fd6c9a59-32d9-4b6a-858b-d3c07dc19dc8/pisaroribid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36981798-3862-43cb-a7a9-cf6ee184f37d/natiruts_reggae_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93737a54-4cea-40c0-935c-3bcd49fa91fa/73890933897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a87e2b-78ec-4f89-a6f0-d824f479484c/eclipse_rp_quiz_answers.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_off0000af73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF73 5432 bytes
SHA-256: 8f91cb41749c30327321376b761271680704b7969945dc870cda2d5ca362bbe2
font_01_sfnt_off0000c1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CF 9892 bytes
SHA-256: ee376a214475b36c593fe3095cf7f5dc4760c540e3628246ce9eface0dbef34e

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