Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d224a99ca648185…

MALICIOUS

PDF

79.0 KB Created: 2021-05-13 11:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d1d3a860c75fa594acf8baf493f0b08f SHA-1: da33314a54b920ffb17b374e101a0e6df7244439 SHA-256: 7d224a99ca648185766e365b1be4984ed999c8d7c8a2f3b8d12cc8c77bce3604
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://nipisod.ru/strik?utm_term=how+to+fix+3m+worktunes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487647/normal_5fc6b88ef31c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471081/normal_602885038236d.pdfIn PDF document text
    • https://rejobasagiletez.weebly.com/uploads/1/3/4/6/134642313/5598b25d2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497370/normal_6051439e09c98.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/3627048.pdfIn PDF document text
    • http://xutefizil.getenjoyment.net/rafavepebasukujasoj.pdfIn PDF document text
    • http://vimabanu.sportsontheweb.net/wanofegikofubafifim.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/5be89030-22c8-41b3-a91b-dd350286f578/jogekutoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d333044-c4ca-410f-9bc5-2b5ed4d34223/pirumonig.pdfIn PDF document text
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_94a8d61da1044e89ab1f8defda7abd54.pdf?index=trueIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_8da7168973454bbb83ff0a0355b7b721.pdf?index=trueIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_fc156eac9ec74d5da81eb91697962e01.pdf?index=trueIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_e28ea7b14fe24328ab13a3cc0fdbaff5.pdf?index=trueIn PDF document text
    • https://ce722411-b424-48ee-ac00-b4ed8818edd9.filesusr.com/ugd/bff0de_ff97ba3d20c74ccfb563a12a923e8ab0.pdf?index=trueIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_c1586da37b9f4a49a7042e9c8200a743.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd5db8f-392b-4eb2-8360-8d2535238a7b/scion_xb_2006_oil_filter_type.pdfIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_18b4514c6a0b4c68a7be1ca1edd168f1.pdf?index=trueIn 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_off0000f860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 5020 bytes
SHA-256: a09f578f1ef3855788035dccf69913b8bdc6bfe646a8a191da15848743480025
font_01_sfnt_off0001097c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097C 11132 bytes
SHA-256: 7c5afaf39be74981c937ce97dd8b0c8bcec841985170fc867d76e79e07f9f9ed

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