Malicious PDF — malware analysis report

Static analysis result for SHA-256 646b7c6174f5a1a0…

MALICIOUS

PDF

76.1 KB Created: 2021-03-17 10:20:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7757cb075b8b36470e17cf5a1b87defb SHA-1: c2bb6a5a0a75592e9c7ecb70775f9732a083fba9 SHA-256: 646b7c6174f5a1a025f0cce25d8541239b7c47802331fd550590cd2a8a3aba3e
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://gimoguvi.ru/strik?utm_term=myles+munroe+books+on+fasting PDF link annotation
    • https://gepajalubawif.weebly.com/uploads/1/3/5/3/135326746/158609a6b.pdfIn PDF document text
    • http://perevod24-card2card.site/94741079088b8i7o.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/wudumijidumomu.pdfIn PDF document text
    • https://likufugusatu.weebly.com/uploads/1/3/1/4/131406708/7015381.pdfIn PDF document text
    • https://fapudunaga.weebly.com/uploads/1/3/0/7/130776769/keveviremibim.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/loxaninezawix.pdfIn PDF document text
    • https://lanigitekepag.weebly.com/uploads/1/3/4/3/134395773/sukez_kukesawelagaker.pdfIn PDF document text
    • https://xikaxuroloxo.weebly.com/uploads/1/3/1/4/131406092/gawabapu.pdfIn PDF document text
    • http://silver35.ru/avast_secureline_vpn_for_androidz616a.pdfIn PDF document text
    • https://mizavuzozubex.weebly.com/uploads/1/3/4/7/134730625/9801905.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/zombie_apocalypse_movie_actress_name4268y.pdfIn PDF document text
    • https://luxutavu.weebly.com/uploads/1/3/5/9/135964445/b88578.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/decimal_comparison_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb53d85-1933-4933-b435-6688ae7c5b22/rca_cambio_keyboard_stopped_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6933ae61-4d02-4695-b6a5-280cd029ddce/81625559836.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a2e1c32-cb71-4873-924b-272419b04377/pijorabi.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/oracle_pl_sql_coding_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16bc2bfc-0a60-40d9-96a6-0dc269c0a49b/wokemebumubuf.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/40184085506.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_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 5400 bytes
SHA-256: 1cb1c97ce64795d640bd8e27f1e864211469521c7bd5c37df670a4a0399dbefc
font_01_sfnt_off0000fcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 10824 bytes
SHA-256: 31df0fa7c31d22b1f927d7c094c25d9a7f27bd0d9c95970af06bae892a68d8aa

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