Malicious PDF — malware analysis report

Static analysis result for SHA-256 b968777bdcaec39b…

MALICIOUS

PDF

82.1 KB Created: 2021-02-22 01:03:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 570f995b902fa14a0334ec9fc70b9739 SHA-1: a6cb4156cfbaf67a89e3900d9a6d4a21bf210f7e SHA-256: b968777bdcaec39bc5251ceb33b09193b65261f2dc376573e22389e532807931
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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://leonvi.ru/123?utm_term=how+to+use+bounce+curl+gel PDF link annotation
    • https://lodofimedama.weebly.com/uploads/1/3/4/3/134327961/felebazijubalos_kaxofepiz_safarorifus.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/3190383.pdfIn PDF document text
    • http://naziniza.22web.org/accessibility_scanner_apk.pdfIn PDF document text
    • http://lami-lashes.site/562244135379zu97.pdfIn PDF document text
    • http://info-pages.ru/51497308368ppr1z.pdfIn PDF document text
    • http://summerita.fun/galaxy_invaders_alien_shooter_pct2zu9.pdfIn PDF document text
    • http://cesaregaspari.com/75378653802llxuo.pdfIn PDF document text
    • http://azorocheat1.xyz/lozijosisefeetjv.pdfIn PDF document text
    • http://tk-time.site/acrobat_reader_10_for_windows_7nz2hs.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://vebavibokifoko.epizy.com/nelson_textbook_of_pediatrics_latest_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/46240946587.pdfIn PDF document text
    • http://fulariponazaget.epizy.com/will_3_phase_work_on_single_phase.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/hospital_management_system_template_free.pdfIn PDF document text
    • http://fozikabev.epizy.com/what_is_lean_5s_principles.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 4784 bytes
SHA-256: a7fadc42dccaf13426d3a8f877e5a4e25a934d7762a2c06c15d385ea3b6ba21f
font_01_sfnt_off000107cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 10852 bytes
SHA-256: a42d926b6735ae0d465ec39a34465e29feb02d0b095cd627215d4a3f4ed2779e
font_02_sfnt_off00012d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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