Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9c65d1947112c1…

MALICIOUS

PDF

96.1 KB Created: 2021-02-28 00:29:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4235f8a888abf710c3d2133c64f44c47 SHA-1: 3c8c0d0c7e5197b33a2239d678bb7b018ae10792 SHA-256: 7b9c65d1947112c15fb293e231fd469f72ed9f461dea3ab4a249555dbc08ed24
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-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://xezojetit.ru/123?utm_term=manual+de+organizacion+y+sus+caracteristicas PDF link annotation
    • https://kodikitowi.weebly.com/uploads/1/3/4/7/134768405/5693137.pdfIn PDF document text
    • https://zopatiselinijil.weebly.com/uploads/1/3/4/7/134758238/43b78b4c.pdfIn PDF document text
    • https://ponorevex.weebly.com/uploads/1/3/1/3/131398269/difijaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480397/normal_5fd275c40f86e.pdfIn PDF document text
    • http://sutovuresas.mygamesonline.org/mupimoredutanobar.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/webolusefan-jaxalew-zekorojipegafe-mowujadetafev.pdfIn PDF document text
    • http://nitesufi.sportsontheweb.net/origami_heart_box_paper_kawaii.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488100/normal_601b32e2d16f4.pdfIn PDF document text
    • https://moforikegumiret.weebly.com/uploads/1/3/2/6/132680993/vifefakebojasuxa.pdfIn PDF document text
    • https://cdn.sqhk.co/gudopokobipa/AjdgdSB/wubipiwanotiwipofiko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bidusibebawuz.onlinewebshop.net/megabutubetewowuz.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/vuxazexobop.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/63705122390.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/15305805763.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/puperakomowap.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/29442239831.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/insulin_sliding_scale_guideline.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_off00013a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6F 5264 bytes
SHA-256: 0064d1620c40f33193148839aee9a334ed602abd986689733bf6fe28c2c71e9e
font_01_sfnt_off00014c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7F 11888 bytes
SHA-256: 0a940967e07d92160c0e6c7414f95c10d6a19076decf53b528958ea32e53865e

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