Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f071803a3d84623…

MALICIOUS

PDF

93.7 KB Created: 2021-04-07 03:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0b6c8890d5aa804abc90e22bbb964346 SHA-1: 75d1570172a48f229c062079f2ab432e72da4f30 SHA-256: 5f071803a3d846233172d3e72131e201e691e0e6b08cac04984fe99476b70260
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/strik?utm_term=direito+empresarial+titulos+de+credito+resumo+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391954/normal_602c182ca7e51.pdfIn PDF document text
    • https://newewakezodem.weebly.com/uploads/1/3/4/6/134680802/3678268.pdfIn PDF document text
    • https://dawerofe.weebly.com/uploads/1/3/4/3/134361643/tawasibasex-nemirelafif-linalawusogofu-zemirexur.pdfIn PDF document text
    • https://xonatiwomunonow.weebly.com/uploads/1/3/1/8/131856992/gefugebisepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408333/normal_60197332f27bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_6052b0c9f3ae8.pdfIn PDF document text
    • https://kizevopizimi.weebly.com/uploads/1/3/5/3/135351298/3e271a85b9159d.pdfIn PDF document text
    • https://kimukotepasa.weebly.com/uploads/1/3/5/3/135329918/1e0ccac9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468831/normal_606922198e2c7.pdfIn PDF document text
    • http://bokifov.iblogger.org/likowo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427526/normal_5fe367fc9dd12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_605a6cce7c43b.pdfIn PDF document text
    • http://vuwagumewaga.iblogger.org/chemistry_reference_table_workbook_2nd_edition_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402956/normal_5fe2863bc61d3.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
    • https://s3.amazonaws.com/senodiw/bavoxujekumodesakupar.pdfIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_731d446e4d1142ff8d684966672f82a4.pdf?index=trueIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_bcfd1869d7b549d0bab0faf03ccd051c.pdf?index=trueIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_098e25eb15fc41c28f963dfaa12ef549.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bajuse/template_for_brainstorming_meeting.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/attendance_tracker_template_for_students.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/53795756623.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 5076 bytes
SHA-256: e97dc168e0b9037a159138074f2a4f12097bcb875c57b9bea448116984dcb74a
font_01_sfnt_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00011642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11642 14864 bytes
SHA-256: 1ee7861c1627a69fe3a3e7d6ed2d2b711fb57dec4369af42fa0ceb785bc8e52c
font_03_sfnt_off000142aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AA 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0
font_04_sfnt_off00015836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15836 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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