Malicious PDF — malware analysis report

Static analysis result for SHA-256 af91827c72a44191…

MALICIOUS

PDF

77.9 KB Created: 2021-03-22 11:20:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a115e494821ff4b946e056189462b86a SHA-1: ccdc43796ad9e782e131f729b74a7f9642e30506 SHA-256: af91827c72a441915defdebc02f32ec58d19c2c1f25840ac00a1f30ca428f31d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to 'jacksth.ru' and a keyword suggesting a lure for information on automatic manual transmissions. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially 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://jacksth.ru/award?keyword=automatic+manual+transmission+pdf PDF link annotation
    • http://faketikus.22web.org/asvab_study_guide_online_air_force.pdfIn PDF document text
    • http://pajebunekelisom.22web.org/wadirefetoguzo.pdfIn PDF document text
    • http://mekozeka.66ghz.com/52936522893.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_f8672525034f441a9106d42ed2663962.pdf?index=trueIn PDF document text
    • http://buzekarutazobe.rf.gd/quizlet_apk_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85122f84-e9da-44e8-9885-ba36116f438a/minon.pdfIn PDF document text
    • http://sasumejexijow.rf.gd/77945686285.pdfIn PDF document text
    • http://kajurilin.rf.gd/ultimate_ninja_blazing_jp.pdfIn PDF document text
    • http://ponuruv.rf.gd/black_and_tan_french_bulldog_information.pdfIn PDF document text
    • http://tuxizosog.rf.gd/blood_circulatory_system_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1289515e-41ad-42e4-86ff-b7c4943a41f2/ford_7.3_diesel_fuel_system_diagram.pdfIn PDF document text
    • http://nefigubisi.epizy.com/4746466793.pdfIn PDF document text
    • http://navadolaje.rf.gd/luwix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/408173dd-aefd-4942-a5e8-67f8f4dc236a/bomabawi.pdfIn PDF document text
    • https://e6a48395-9ebc-465e-8505-c4b20d7b8e72.filesusr.com/ugd/81e12b_602f946e9dfb407e81e4a9c2c1b60f65.pdf?index=trueIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_22e3a97028564b238bdabd9241c53e02.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe341633-20a6-4704-a502-60b27412def2/lotimodebexixupitupulelo.pdfIn PDF document text
    • http://nalosig.rf.gd/62516342621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/905e340e-cc14-4b9a-8aa5-944cdee3b9eb/divine_mercy_parish_hamden_ct.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_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 5288 bytes
SHA-256: a0cd81bc377e34bb0e19adc5727d393b093b90779bde5fbe4d8643961b9e7c41
font_01_sfnt_off000105ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 10800 bytes
SHA-256: 2d5703d1a0f8295911429be29a3d07a2fa8ca62368c4df7deab35cb035017058

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