Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbf715d2a4c7fca…

MALICIOUS

PDF

83.1 KB Created: 2020-11-13 13:38:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0a64e4f03b5bf0d6468a8260de1b6fbd SHA-1: 1711114e9b979761b4fdf644a6a9fad437752e7d SHA-256: 5cbf715d2a4c7fca219e66e7a4dbddd86504ddb0a38306f2ecc4beb677281e19
214 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 and routes users through malicious redirector infrastructure. 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-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=sony+vaio+pcg-71913l+drivers In PDF document text
    • https://nibojesuko.weebly.com/uploads/1/3/4/3/134329062/3323497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_5f8c7022ef7f1.pdfIn PDF document text
    • https://segelibuvak.weebly.com/uploads/1/3/4/4/134451144/4c6b2f809c3f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5fa1baa42add1.pdfIn PDF document text
    • https://zeteparikimifol.weebly.com/uploads/1/3/1/6/131637109/8f42c5b60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387701/normal_5f9d414e9236a.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/0a99a74f-6169-4b04-8f40-59c0eb414734/4205597318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/544256d2-3248-4cfc-ac22-73e465f43849/85699958664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83911078-c1cd-446c-8766-665435be19d8/zitolitopivaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ee8eb3-f2a4-4481-8092-c8b30b62f0d9/88679960935.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/best_switch_axe_build_mhw.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001125a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1125A 25840 bytes
SHA-256: 006c98602dc052978a7a4f99cb2ccdb47aac2e3e9ac98a3fc7914ef44bfeab30
font_00_sfnt_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 5988 bytes
SHA-256: c2fd2a8913f38463bd935cf7155f855a65df838b1dc6a4a03f657d3ee873c8cc
font_01_sfnt_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 10908 bytes
SHA-256: 3d84ac643a29e5d981a85a37a7c965c55c2c7b7929ab135d26c76b445000d0b9

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