Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fc58e0de08e20a…

MALICIOUS

PDF

88.0 KB Created: 2021-03-15 11:35:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d5f2d10fb18613dae1e1c18ca15b1860 SHA-1: 90167d60902e63c324243b73b6e3de8e3749daf6 SHA-256: a2fc58e0de08e20a391dbc24b2e19440d8fd68d088a6b18534332621c77b2c96
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/strik?utm_term=drivers+ed+chapter+10+vocabulary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384628/normal_6029ce3e7cf2e.pdfIn PDF document text
    • http://tiririmu.22web.org/29933277936.pdfIn PDF document text
    • https://rokosogamutoluf.weebly.com/uploads/1/3/0/8/130873735/6d0065.pdfIn PDF document text
    • https://kasorewo.weebly.com/uploads/1/3/2/7/132740312/fexusobinujip-fugewarar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424645/normal_6043e92c8412f.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/2646700.pdfIn PDF document text
    • http://gedawirij.66ghz.com/jeans_size_guide_zara.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501361/normal_5ffe26b1d91a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465935/normal_601ecf211b8c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413227/normal_5fe4fc71ac950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_603ddd88cc73b.pdfIn PDF document text
    • https://malafusid.weebly.com/uploads/1/3/2/8/132815748/pivufizaduma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380226/normal_6028f8f0a590a.pdfIn PDF document text
    • https://wobofosowipifir.weebly.com/uploads/1/3/0/7/130776138/nivitaj_vameveb.pdfIn PDF document text
    • https://zibekasosux.weebly.com/uploads/1/3/4/0/134040395/sagetomepo_gimowopetut_zerupesikupob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459165/normal_6012a74690ede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449627/normal_600eb3c55bf9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muvalinifotu.rf.gd/96514844381.pdfIn PDF document text
    • http://gamutazuzores.epizy.com/how_to_write_a_college_entrance_essay_about_yourself.pdfIn PDF document text
    • http://tiwebukesa.epizy.com/19242850416.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 5656 bytes
SHA-256: a2e6bcf3017896df1c2a61c7169b3a2e4e3228671d1dcee6a6cef44d69f2c986
font_01_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 12136 bytes
SHA-256: 0fe1958a64dd2418f4614fbe01bb2e603d03f724b5694a8685b40608d88b2cf5
font_02_sfnt_off00013cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB5 16200 bytes
SHA-256: 6e54b21cd08a0329d276fa4aa27f19b7625bf763ac2ec9191afc638607ee0c07