Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a50b408e167e111…

MALICIOUS

PDF

85.9 KB Created: 2021-04-01 13:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4d04d07c8f024011104ab6dd5fe7e112 SHA-1: 2af4b1a4d8fe15300a4fffb29bccecbf25a69f9d SHA-256: 6a50b408e167e1118fc88072183a4f25d2d649d1b53dde109765b57bf31f1c65
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high number of embedded links pointing to various domains, many of which are on disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/wix?keyword=pac+swi-ps+vehicle+application+guide PDF link annotation
    • http://wokizunapajunez.iblogger.org/78405682721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472763/normal_5fd86c5a6798f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451231/normal_5fd611d7bc948.pdfIn PDF document text
    • http://itawegan.fun/animal_crossing_hair_salon_guide0x79x.pdfIn PDF document text
    • http://bt-management.website/95103111277tlwkr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469638/normal_5fe7c9981f4b4.pdfIn PDF document text
    • http://perotaraze.22web.org/rezavomerobitebi.pdfIn PDF document text
    • http://pubguckazan.com/fulopakuxusavobasoketaczx8d.pdfIn PDF document text
    • http://getveran.site/90415497513n12ck.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387931/normal_5ff632b902d8e.pdfIn PDF document text
    • http://easy-money-cash.space/properties_of_addition_worksheets_grade_25pqul.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://bopamebedozupux.epizy.com/nervous_system_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad805a9-7573-4a79-a50a-e6adfbddffaa/1976557524.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/how_to_take_evening_primrose_oil_to_get_pregnant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e31c7f0f-7044-42e4-a37e-6c6ce1a7da14/vumepipemulewi.pdfIn PDF document text
    • http://xegiseko.epizy.com/23451294305.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/weather_report_guwahati_next_10_days.pdfIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_97d2529339cc4a12b6d07d9fbb614655.pdf?index=trueIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_2e510fff48cf4f0a8b5f36a282422e64.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1785b5f8-7cc1-4d1b-9844-534e837c0bb0/nordictrack_c1800i_weight_limit.pdfIn PDF document text
    • http://surozot.rf.gd/7153389429.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_off00010045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10045 5308 bytes
SHA-256: fe17c16fc118bf466a54675c5c466bd067ddd30a74d11450e5e91d53442fec49
font_01_sfnt_off00011267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 11720 bytes
SHA-256: 1d4386039b21188cf2e03c154a3d3012fb5d920b90a2306fc12f33d19361d5e0
font_02_sfnt_off00013a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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