Malicious PDF — malware analysis report

Static analysis result for SHA-256 471f2c9415ed7b47…

MALICIOUS

PDF

68.0 KB Created: 2020-11-23 19:16:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c11181f35209d8f2b803fe2c5961998a SHA-1: 114b634c0a5f1701a91d057b188186d9d98785a6 SHA-256: 471f2c9415ed7b4763a44605d439c868e632b8a8afaa72f3fe36ef5579ff240e
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://traffine.ru/strik?utm_term=exercicis+de+connectors+catal%25C3%25A0 PDF link annotation
    • https://laverikiwife.weebly.com/uploads/1/3/4/5/134502667/4004344.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/sulusilalope-jobede.pdfIn PDF document text
    • https://rawunixu.weebly.com/uploads/1/3/4/5/134527334/lefozilulugop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387408/normal_5fa5b14eb92c8.pdfIn PDF document text
    • https://pemidala.weebly.com/uploads/1/3/4/6/134667230/1e946a7c.pdfIn PDF document text
    • https://vedabigejiko.weebly.com/uploads/1/3/1/4/131438046/5025381.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/e75f7f2d-3c23-4bd8-8127-fbdddead68f7/homework_passes_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c15db9c4-7843-4b6f-a24b-80d24cd4e5c5/kizurejebikumuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a69b9946-d5e3-4bca-a5ac-be56e9129f16/vobipakadizikoz.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/ball_auction_realty_group.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df55053-f41c-49f0-b823-5f9b1989a0b6/nurifimilagomuzujelokaju.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/zinenolakigizedumemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b2a0fc-83d2-4700-ace6-678e0cce1d48/50171786385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e0d8687-3b42-4926-92cf-f37765af1603/lenox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3864ff14-ec8c-4ef6-9735-3670108a7104/20223146034.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_off0000cd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD73 5192 bytes
SHA-256: a1a0cc87216d7f7b021b061f92568e6572d45c4ab4c9fcbed3909738a7885eb6
font_01_sfnt_off0000dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 10148 bytes
SHA-256: ca4f98337a10577bd102119c5f565b88ed7861a171091cb0c18d5c0d2ba103b3

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