Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b5e3c4869dadc9…

MALICIOUS

PDF

77.2 KB Created: 2021-05-19 15:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f9fb363182ebdd233896f6ca7a7591e5 SHA-1: d4f84c8c92a5d8f168252630b425648bbd60abd8 SHA-256: 27b5e3c4869dadc9a7c1f82e65cb1c720f7db5ea2501dd5785f7122820a67ca1
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 0.9999

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://druttle.ru/strik?utm_term=crash+bandicoot+free+download+iphone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384839/normal_606e5faec867f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381081/normal_5fcf237857acf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375200/normal_602dc64da1315.pdfIn PDF document text
    • https://xopezafetuwov.weebly.com/uploads/1/3/5/3/135314897/6334558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417418/normal_602bf58d742d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371783/normal_5ffe828c4e7d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384050/normal_6001e46675f09.pdfIn PDF document text
    • https://posilopawirina.weebly.com/uploads/1/3/4/3/134353572/17589b990.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449629/normal_6044ae7e0f4e3.pdfIn PDF document text
    • https://wivozodibadire.weebly.com/uploads/1/3/0/7/130775536/vitelidumokozif-fawevujejur-dabiluguxiga.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/c99143f3-84ae-46da-a8ca-afb0bef43af1/87305310027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/260328c2-fcdc-4361-94cb-d4fe5d367486/dilurabuziluloru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e88894-2bb9-41a5-877f-9bb314796731/the_hunger_game_download_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64cd4095-3a0c-41ea-aee3-06330511fab6/interaccion_materia_energia_ejemplos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ec40c6a-4956-4aae-aa02-b9c4121c35b9/55333254726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e57dc15-48a4-4643-b643-11ebd9460d22/99417552269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9058b8e5-0598-4ba1-ab4c-e55425b67130/47424086301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996e653a-1131-4d59-88bb-2fb906e4e66e/what_is_a_gy6_150cc_engine.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_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 5380 bytes
SHA-256: 6bc7cb9c404df032873c008efcd93a43518a57de145080d687efee13c9edc614
font_01_sfnt_off0000fbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFA 13124 bytes
SHA-256: 4fc5e9ddc8717c5ca8888824e8c54640d08c48e0180ca35c103a51bfe6db6af3

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