Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a59dfc3b41ffc4…

MALICIOUS

PDF

94.0 KB Created: 2020-12-17 23:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7df061834b136fea91995f8936c977e0 SHA-1: d79689cc54fd2d6b2a8d48dc01585020df2d4bd5 SHA-256: 89a59dfc3b41ffc4f8c632140aae6bce6fc8a4bc288a21049f56cb935abecc49
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/123?utm_term=course+of+study+job+application PDF link annotation
    • https://xeluwase.weebly.com/uploads/1/3/4/8/134850208/1d214895881.pdfIn PDF document text
    • https://mujunoba.weebly.com/uploads/1/3/2/6/132682006/puvufija_demasidubifib_dufuxubadig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481052/normal_5fb7380baa8ca.pdfIn PDF document text
    • https://kenilajapa.weebly.com/uploads/1/3/1/0/131069910/dfe5471fa8.pdfIn PDF document text
    • https://rebumazezip.weebly.com/uploads/1/3/4/8/134860465/63564.pdfIn PDF document text
    • https://xolovimuwoza.weebly.com/uploads/1/3/4/8/134865524/muwux.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://static1.squarespace.com/static/5fbffa571c8c7413142c9acf/t/5fc25fbd9d79364840da85e2/1606574014134/thermodynamics_properties_of_pure_substances_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4014731-67ea-4847-a2f1-c421de6ea6eb/28791234976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc89ee6-cf55-48d0-ab13-f01b4a3a584f/types_of_nose_rings_for_nostril.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df709ea-efc9-4afa-9080-c0580a85da2d/black_ants_and_buddhist_chapter_1.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eb79e5c7695ca99bb922/t/5fc3ddc83f75b166434abff5/1606671818751/download_zello_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf54b4eaf37e3b6492ad37/1606374580736/identifying_aliens_with_a_dichotomous_key_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/379393ec-a8d1-4b74-9025-f4e7faadd61a/ifsta_company_officer_5th_edition_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/803ef0dd-6b2c-4675-b5c5-b0087f35eda4/17521560240.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_off000125b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B3 5372 bytes
SHA-256: e30246c4740f7b7657efe92be25db183c709dd4c8b40b83ed8bd269347f1e69f
font_01_sfnt_off00013816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13816 10668 bytes
SHA-256: 9568756241d5433dedcc4594685d5565c89ca0f48d2284b287eac6e78db7033d
font_02_sfnt_off00015c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C8F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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