Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cb3da54fd39175…

MALICIOUS

PDF

64.8 KB Created: 2020-11-25 23:17:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 770a2c22060647d24edc13a1fa5d17e5 SHA-1: d98b16515dea2fc065f79c531b24396a4953ee96 SHA-256: d4cb3da54fd39175dfb56601c96887c70f163da6c4a4df8e3ec8d69e0b3a4ed3
186 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 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=binary+covalent+compounds+worksheet+answer+key PDF link annotation
    • https://fasuwilobavofe.weebly.com/uploads/1/3/4/4/134489762/janevelup_mikewom_visixijefakeze_solejej.pdfIn PDF document text
    • https://bowukobi.weebly.com/uploads/1/3/4/7/134706413/3117436.pdfIn PDF document text
    • https://kakawugob.weebly.com/uploads/1/3/0/9/130969990/fetuseximekurejunasa.pdfIn PDF document text
    • https://rogumine.weebly.com/uploads/1/3/4/4/134448770/0c8f6.pdfIn PDF document text
    • https://vosorebozo.weebly.com/uploads/1/3/4/6/134698499/1787284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383146/normal_5fa59e15d729d.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/77e07fb6-9d78-46e1-b102-d14dfd404a3d/94979128333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d6ee70-94f9-405b-bf36-206f0c4200a9/descargar_mountain_lion_10.8_mega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d1729cb-0d92-4529-9c7d-0a3929f730e4/tojogijaneli.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/2012_mini_cooper_service_manual_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/95397817927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a60ce958-e8db-4e00-8a96-ebbb6e46606c/66299110337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa8d7a1b-2dcd-4e25-93a5-37e8658d0b30/jesozunivobumuve.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_off0000b45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45B 5564 bytes
SHA-256: f9e41f5770b62b0bffcab9fe7991a1136afe6cdd10d980bc7f2884e58124f5f6
font_01_sfnt_off0000c723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC723 9768 bytes
SHA-256: bb2fd6d75353be02d2f8bd13c8902d3199ddbee8560ca51499c330118a74fdba
font_02_sfnt_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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