Malicious PDF — malware analysis report

Static analysis result for SHA-256 911b8001f573d340…

MALICIOUS

PDF

70.6 KB Created: 2021-02-01 22:04:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 818e0d9317348ccf49f08ba3d22c5b60 SHA-1: de79726599df83edc489a1033a45a868e38bd3c7 SHA-256: 911b8001f573d340692b8ee382b97cf26f2401dcd3aa287f3c43b7b6cf462681
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were extracted, the presence of external URIs and the overall heuristic profile point towards a malicious document designed to redirect users to harmful content.

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://baarspo.ru/123?utm_term=loading+dose+and+maintenance+dose PDF link annotation
    • https://cdn.sqhk.co/beratinuga/gdvijia/p_o_cruise_ship_azura_deck_plans.pdfIn PDF document text
    • http://pulemovidake.22web.org/amazfit_bip_watch_faces_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467027/normal_6002d9ecb3bde.pdfIn PDF document text
    • https://cdn.sqhk.co/nilimijano/cjdRVje/vokadekenipixegunemuxopa.pdfIn PDF document text
    • http://betmoy54.com/iam_751_boeing_collective_bargaining_agreementr8skq.pdfIn PDF document text
    • https://cdn.sqhk.co/bidelefo/uXgfhfA/guess_the_celebrity_baby_quiz_answers.pdfIn PDF document text
    • http://liolika-rsya.ru/betamemaaemr3.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/bisilidipositidatawo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497687/normal_600d61ad2db10.pdfIn PDF document text
    • http://scarcebook.com/walter_riso_enamorate_de_ti_descargarpe9jw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/algerian_bold_font.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/pibesemudel.pdfIn PDF document text
    • http://tuguwobafadurot.rf.gd/bca_finance_annual_report_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/circulatory_system_parts_and_function.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/xezalimadozeb.pdfIn PDF document text
    • http://lemutuzuvaw.rf.gd/fipubi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CE 5072 bytes
SHA-256: cf7d2b2babbbffc697e013e48a36fcb11f20961897282965dddb16f65fce5ee8
font_01_sfnt_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 10652 bytes
SHA-256: 2a8e7aacd7c06bf6c976370b8c326f6b0313b3bacfad2324e2eac3ffeb105d97

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