Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d5c688ec198c01…

MALICIOUS

PDF

79.6 KB Created: 2021-02-03 16:19:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e0e67c8632a43e6e12a8ae937165110f SHA-1: e963248fabd7aa55ee57324af4e2f828866901ed SHA-256: a3d5c688ec198c0192bf8c1aa3d02258641993686f751468b8ffeb6670db6273
134 Risk Score

Malware Insights

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

The PDF is flagged as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm designed to obscure malicious URLs. The 'SE_INVOICE_LURE' heuristic indicates a phishing attempt using an invoice theme. The embedded URL and the link farm structure suggest an attempt to trick the user into downloading a secondary malicious file, likely a phishing document or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://baarspo.ru/aws?utm_term=free+printable+invoice+template+canada PDF link annotation
    • http://detonic-ro.website/vajidobereni8nbfy.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/KKpggwO/zovimijebori.pdfIn PDF document text
    • https://cdn.sqhk.co/zifixanuk/heAjhcn/my_talking_tiger_game.pdfIn PDF document text
    • http://hookup153.fun/download_piano_tiles_2_mod_apk_ios1kyng.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/aDPWifC/68599138668.pdfIn PDF document text
    • http://policyhelpcenter.com/28824365201h5gbv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bojibag.epizy.com/hawks_nest_weather_report.pdfIn PDF document text
    • http://kodugexibitomo.rf.gd/28637667925.pdfIn PDF document text
    • http://mogigavuxifiti.epizy.com/running_plan_for_weight_loss_beginners.pdfIn PDF document text
    • http://bekujosekufeto.epizy.com/certified_information_systems_auditor_study_guide.pdfIn PDF document text
    • http://nodezolejew.epizy.com/dawaxojofinesil.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/endnote_x7_software_free_full_version.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 4984 bytes
SHA-256: 50b47d2c441caf79a7e1fb3e70e584c7eb04c8eaa9fd48c69d0811d61e04cdd5
font_01_sfnt_off0000e8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A1 10916 bytes
SHA-256: 49a3c97231e8b581a5b474c3deedc5899c33eafebe1ebad6dc6270384f56acf8
font_02_sfnt_off00010e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E01 16144 bytes
SHA-256: 764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf
font_03_sfnt_off00012302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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