Malicious PDF — malware analysis report

Static analysis result for SHA-256 856c34e673847c47…

MALICIOUS

PDF

80.2 KB Created: 2021-03-19 12:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1619576554faad2d8e3e94d24686c251 SHA-1: 52467276bdd664e6bab69face956bff71a27f9fa SHA-256: 856c34e673847c477b0cdecf1fac0d2c597f9ea7f2b60ac7ff4d703a838cd945
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://vilenefex.ru/strik?utm_term=black+hawk+down+book+amazon PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380226/normal_5fc750fbd5963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427529/normal_601704d90eca6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369322/normal_603e37aa39176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419640/normal_600a5829b3b68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530457/normal_602bb02f1f21d.pdfIn PDF document text
    • http://vefefex.iblogger.org/23254292357.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369491/normal_5fca92544961a.pdfIn PDF document text
    • https://kodopikowi.weebly.com/uploads/1/3/4/6/134659436/bb4fd74fe31.pdfIn PDF document text
    • https://bafizotadax.weebly.com/uploads/1/3/4/7/134761596/jurefuwuwamapav-tetawanetija-wimerefekudosi-saruxoganogakab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465025/normal_6020f8fb616e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_79985c108c4e4a529191ef516686cee9.pdf?index=trueIn PDF document text
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_7fde73db71e84e059cbf83500b87c49c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78bbaf85-e3d0-489e-9bb0-6cd1b419d677/gajudusogiwarefudazuruji.pdfIn PDF document text
    • http://nitaxukim.epizy.com/facciamo_il_celi_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/748d0249-864a-4f18-9bd2-a9c13663f6d4/baldwin_letter_to_my_nephew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcff65cc-2b3f-4be1-a3e9-d93219fccaac/43412891628.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_off0000fbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCB 5300 bytes
SHA-256: 23184acc9308341817063a262a8cb7a2f1cc82e5da44db1efcfb399a485843f2
font_01_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 11068 bytes
SHA-256: 95ae13cd82aecd24fa0016935ffd30472384c3b86893c125cfef17ebf0ec7594

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