Malicious PDF — malware analysis report

Static analysis result for SHA-256 5403db6f8a17cd6b…

MALICIOUS

PDF

78.1 KB Created: 2021-06-09 13:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 113c99a3672c0419695c36edc8396c36 SHA-1: 1d085f698174ecad691ec8700f5787723c7bff6a SHA-256: 5403db6f8a17cd6ba5ee18f5c8b69fe91f332a168735a707dfdbc7587d887b5e
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/123?utm_term=forces+and+torques+in+equilibrium+lab+report PDF link annotation
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/zolamo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420238/normal_601afd17d5bb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416131/normal_6019f85cc144e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_600dc247f40e8.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4461245/normal_60b0c6570e115.pdfIn PDF document text
    • https://kinumonitebira.weebly.com/uploads/1/3/4/6/134605003/7e3ec436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386361/normal_6026a7f8c4e25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426832/normal_602477899de82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501029/normal_6020a2a051558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490264/normal_60209a699fb1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500453/normal_5fed5a6b81e44.pdfIn PDF document text
    • https://sozugubew.weebly.com/uploads/1/3/4/8/134893137/8058379.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/5c3e0046-3a74-43eb-8738-379746b68308/can_you_get_medically_discharged_from_the_reserves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e5aeef-f374-4032-bcc3-1a2226a95323/28372133454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5195ad7b-cba3-43b8-a525-df0519bfa051/stihl_bg55_blower_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4259b74f-7154-43e2-b005-1a7ccd3cf704/17686984047.pdfIn PDF document text
    • http://jojekepodef.pbworks.com/f/is_professor_moriarty_sherlock_holmes_brother.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/451d2e13-ef77-4025-afc9-ea27a3e791f3/20260862632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/935f52aa-b058-43eb-91a4-997e783ae0a9/17155582703.pdfIn PDF document text
    • http://xibosini.pbworks.com/f/kagizakokuzovaxoworawut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e3aae0-c553-42c1-9f4f-568b4f32e413/wewibadiwab.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_off0000f230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 5440 bytes
SHA-256: f6b317037d36d2e652a72ffe7c6d94b6f03ad7c6cc30e9cd11c170d9d1e67086
font_01_sfnt_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 11084 bytes
SHA-256: 6350b1568773e85681d4f69bb983143e2a9da6625b1aa015c758c2e07bd44530

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