Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b25bb0be291e546…

MALICIOUS

PDF

73.9 KB Created: 2021-03-01 06:57:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 31e87e3d3963b45449ec0ad5f92e3d9f SHA-1: 2167c3a51bb9d43f42265f26b75227d2ae139c8f SHA-256: 7b25bb0be291e546376d8ad92224163bb4f57a1ed11b62ccf63056a3f4d4144e
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is part of a scheme to distribute malware or phishing content. The document body, though heavily obfuscated, contains text related to a 'critical thinking textbook pdf', likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/123?utm_term=critical+thinking+textbook+pdf PDF link annotation
    • https://poxapoxidofex.weebly.com/uploads/1/3/4/0/134016688/dugebezapesuka-sowativibijeped-fipajumosoximi.pdfIn PDF document text
    • https://cdn.sqhk.co/tirinakiweda/tqhdRBe/93558180576.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480598/normal_5fde86269aa4e.pdfIn PDF document text
    • http://sizoxuk.22web.org/how_to_say_study_hard.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/what_is_criminal_law_australia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466379/normal_60111366642fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412582/normal_600cb5f8e2261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_6027d9d7b1ef1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://werewipabelud.rf.gd/dj_villager_sa_2018_songs.pdfIn PDF document text
    • http://jipezanegasan.rf.gd/history_of_the_world_part_1_netflix.pdfIn PDF document text
    • http://pivujumurabaf.epizy.com/weather_report_for_cartersville_georgia.pdfIn PDF document text
    • http://fogidifi.epizy.com/nso_philippines_birth_certificate_application_form.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_off0000e2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E7 5416 bytes
SHA-256: c3e1f47d3b75bfc5aac5dbcd7749f1e8a9c6522ac45bd6b30a0cf60c445b05c5
font_01_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 10928 bytes
SHA-256: ddfbdb6db59deea180f14feb687c6f2534c6786ce59a81cd7fa41587d9a63015

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