Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d4394dc99d4fa5…

MALICIOUS

PDF

76.8 KB Created: 2021-03-01 03:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 05a3522ddca87012a5005c0cb4ec6c99 SHA-1: 95f26bda2192cd85c5e40f9fe1e52c4a412c5dfc SHA-256: 63d4394dc99d4fa5a07769138016e6fa0584ba8bc09950621fd07b71d1228a1e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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 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://seumenha.ru/strik?utm_term=principios+basicos+de+la+economia+social PDF link annotation
    • http://sexedate69.site/jasirixowiloropisbes2h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427300/normal_5fcfa5af058d1.pdfIn PDF document text
    • http://paksorond.xyz/minecraft_banner_designs_guide3sqfi.pdfIn PDF document text
    • http://lokogosomezik.iblogger.org/dukat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449615/normal_5fdd926db978f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379471/normal_603280613eb51.pdfIn PDF document text
    • http://bewizevamud.iblogger.org/toshiba_regza_37_lcd_tv_manual.pdfIn PDF document text
    • http://megalit-korolev.ru/67246663231z89df.pdfIn PDF document text
    • http://lbaranaydin.com/lotaln3flg.pdfIn PDF document text
    • http://autokenn.com/nipinond7ct.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451231/normal_600be94c1337c.pdfIn PDF document text
    • http://kegeminu.iblogger.org/wepezurutimapim.pdfIn PDF document text
    • http://begetus11ppz.xyz/dmv_ct_test_questions_and_answers_spanishhk05a.pdfIn PDF document text
    • http://kekajavulaj.iblogger.org/19377783346.pdfIn PDF document text
    • http://koreanluxe.com/afrikaans_language_notes5if57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387582/normal_5fcea13eaa553.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nisuzadusidu.epizy.com/62257658481.pdfIn PDF document text
    • http://kaxemazetoralib.rf.gd/lirotobusitanajadifufukin.pdfIn PDF document text
    • http://zuzitubop.rf.gd/rutitomazafepebiwaj.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_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 5360 bytes
SHA-256: cd8b2c923c6aa52281a2bacdc7a6268f876f1fa609ae89533b03a752fa441a34
font_01_sfnt_off0000fdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 11904 bytes
SHA-256: 4a2001db817b9cb3f2786082eda99c125fe2d5f303bc3b27277fc1a1383043cf

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