Malicious PDF — malware analysis report

Static analysis result for SHA-256 6252df44a1a2d5b7…

MALICIOUS

PDF

69.7 KB Created: 2020-11-19 18:16:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0be03c18740cf6b5ec96e594afdabeb0 SHA-1: d17704bdd7f92c21a3a2c205ef6f1238c19cf7f9 SHA-256: 6252df44a1a2d5b7374cbbf5ade66064ee8687bfe747087ddbb8799fde9b8ad7
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 0.9997

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
  • 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://traffnew.ru/strik?utm_term=cuentos+de+jorge+bucay+para+escuchar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460230/normal_5fb2c49f9a44f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498986/normal_5fad2c4ad728b.pdfIn PDF document text
    • https://fofoxugijajeb.weebly.com/uploads/1/3/4/7/134729320/jufujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_5fb48c2751f75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425501/normal_5f9a0300e2ad6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416918/normal_5f9ffeb409d47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393035/normal_5f95f16128a1b.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/1a332673-6bd4-4655-a6b1-291b82a33b39/little_big_planet_3_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f068a5b1-2e04-4a43-9b9c-3f4e7e70dd1d/felavige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2891a8b-c832-44e3-8cb8-5f16c09da030/hbr_must_reads_on_strategy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b32ffb4-acba-4351-a16a-1de01609cec4/robiriginoxibu.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_off0000d0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D2 5528 bytes
SHA-256: fbecca669d193b07b325cdab223936e7e56030f0242ef8ea38b4b994a8843eed
font_01_sfnt_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 11416 bytes
SHA-256: 0d1ff24467b7e973473f20917872e9a2104becb22e665034298edc2db08ba199

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