Malicious PDF — malware analysis report

Static analysis result for SHA-256 fab40f9f31628b38…

MALICIOUS

PDF

73.1 KB Created: 2021-03-15 09:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9086cce2abedef91b03dfdb5a1058b44 SHA-1: 85eac8f817c917308f9e0d2e2a1c217718cd775c SHA-256: fab40f9f31628b3840175e49807e8ab82bfe0379d0dd3c32a14fc89bf78ca770
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=good+living+guide+quotes PDF link annotation
    • http://nejenowavofol.22web.org/engenius_durafon_pro_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_604dd2f2e24ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_604d192da503e.pdfIn PDF document text
    • https://cdn.sqhk.co/bogijifaviba/icvd8ii/vukinogafetige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_6025ba7dadeab.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/YidhgNm/jadazigabodi.pdfIn PDF document text
    • http://daxepekudinis.iblogger.org/cavan_biggio_scouting_report.pdfIn PDF document text
    • http://volazanuva.22web.org/aldington_primary_school_ofsted_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_604ac73dcbba5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421468/normal_6008e4ab12dfa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406514/normal_5feb6805cb205.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_6015929700379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_60210ecc1e847.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://golanuzozabidow.epizy.com/vusotafaxowinaxemogimibi.pdfIn PDF document text
    • http://nutujetis.rf.gd/2016_answer_key_ctet_february.pdfIn PDF document text
    • http://jejesufunaderuv.rf.gd/40832278499.pdfIn PDF document text
    • http://muxajetolalet.epizy.com/14371288405.pdfIn PDF document text
    • http://zezezej.epizy.com/28022749318.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_off0000e21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 4904 bytes
SHA-256: 61cb14837ce0ccf37a17b5ba1392cca5286204c920fec0c65c97184d43dbbb15
font_01_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 10780 bytes
SHA-256: 272f421a3d7066aa42b666e93c67e942817c9935c4ee50239bf93c3aa1521a25