Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cffcf21483a78c…

MALICIOUS

PDF

71.1 KB Created: 2020-11-25 23:20:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 71a534459e028a1400fbc4229b34ce35 SHA-1: 2d815efed3edf360a8541ffa2fde1bfeda6fe8fd SHA-256: 65cffcf21483a78cce7cb02c761e09543e9604d863781d5b3179b6660bb2744f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, with one prominent URL pointing to a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'infinitive phrase example list' to entice clicks on these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=infinitive+phrase+example+list PDF link annotation
    • https://janejamav.weebly.com/uploads/1/3/4/8/134887015/mudimogewoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_5f8dd3ef25136.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://uploads.strikinglycdn.com/files/ce4dadcd-bf1d-44e4-90d1-4a0700743fdc/karissa_shannon_porn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18bb6ed1-e795-472e-ad89-250e1286e361/sorebixefajebedugewal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a1a9793-280a-4879-a30a-297c34dee1fe/namedotimasuxanugesive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2912142-197c-4514-aa18-c4993fc92c8d/75408874020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/985dca6e-b098-446b-90af-c70e521dad9c/zosajadezif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1c650d8-0487-457f-8399-dfecacf9def7/2703412338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e627d61-f0a0-43f5-959f-68c28b5496f1/elise_wolff_elementary_start_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4697ca3-3a57-41d4-93a6-90dfac9aaf8e/72281698299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7125d93e-45f8-4f1c-b431-87ffc01bc70b/54854382821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac8f5854-66a0-446b-92ab-8cb606395744/nexanumomajamosutixij.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_off0000cf26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF26 4884 bytes
SHA-256: 553bbc512ba72f3e0e16b70183df99f0e116d41158081a398c81f0861565fcc3
font_01_sfnt_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 9844 bytes
SHA-256: 47cac3f4259dd9634ba20b589551ee70131301ae289ae3bc43d9042c30e46147
font_02_sfnt_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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