Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93d26a7806c9820…

MALICIOUS

PDF

75.3 KB Created: 2021-04-07 05:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 38a61b8ca6f3d959edd1e6b96a7076c7 SHA-1: 5b278c66246215df3a858491b1ac92dfcf1bca4f SHA-256: b93d26a7806c982081a6560d4431676494dd90635038a7b33464607581ed3072
126 Risk Score

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 0.9997

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://pelibifir.ru/wix?keyword=dlab+study+guide+reddit PDF link annotation
    • https://forilulan.weebly.com/uploads/1/3/1/4/131408022/ad9b49ef0.pdfIn PDF document text
    • http://peuly.xyz/who_won_the_most_golden_ballsw9vpq.pdfIn PDF document text
    • http://pubgucbayim.com/vebojemiwoderejowmdil.pdfIn PDF document text
    • http://pearhaidhr.fun/college_brochure_design_psd_files_freefqg0t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403938/normal_6005cb373f85a.pdfIn PDF document text
    • https://razovifizekojo.weebly.com/uploads/1/3/4/4/134439397/1503245.pdfIn PDF document text
    • http://axecheat1.xyz/kafomezezizedetcqd8r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416666/normal_6017dd49b2cd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470221/normal_6014f77a4ea7b.pdfIn PDF document text
    • https://tunuwadubozowe.weebly.com/uploads/1/3/4/3/134363043/8651986.pdfIn PDF document text
    • http://minuette.me/40573990369fprzp.pdfIn PDF document text
    • http://coolmag.biz/javosevofopituljplwu.pdfIn PDF document text
    • http://servempieza.site/world_economic_freedom_index_2019_india_rankpnms0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484356/normal_600c178cb9fc4.pdfIn PDF document text
    • http://natlab.ru/windows_7_home_premium_oa_download_isow5dl1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410194/normal_5fc6640b7f1ea.pdfIn PDF document text
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/10625a5d0d.pdfIn PDF document text
    • http://checkmycredit.info/best_international_finance_jobsfau4d.pdfIn PDF document text
    • http://myyshooop227.site/what_are_news_values_and_why_are_they_importantajfqq.pdfIn PDF document text
    • https://gikatufezido.weebly.com/uploads/1/3/4/3/134338368/fumujaveke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 5236 bytes
SHA-256: 1de3e0a83ff769495c7aecf7ab0eb5388472fcbee8b36ac387e49cc82a30bf06
font_01_sfnt_off0000f96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 10996 bytes
SHA-256: d41d9417f67dc41e561dc2be0c16baebe2b326665092e5cd235082b9d1cfb0ee