Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33b1899e1ab0d1d…

MALICIOUS

PDF

68.3 KB Created: 2021-06-09 05:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b1b268970781bccc7b54f69f460ae5e6 SHA-1: 5447b674d2daad96339c71681b54a6dbd95b4b16 SHA-256: a33b1899e1ab0d1dadde4580c454ad5fb3989da1a3d36a17459c00bfe9a5d2ec
156 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, a technique often used in SEO link farms to manipulate search engine rankings or distribute malicious content. One of the primary external URLs, 'https://medvor.ru/pbw?utm_term=xev+bell+porn', is flagged as suspicious. ClamAV detection and ML classification strongly indicate maliciousness, pointing towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://medvor.ru/pbw?utm_term=xev+bell+porn PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5fcdc1e8a0c47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480173/normal_6052eb7b3b4b5.pdfIn PDF document text
    • https://raguloduw.weebly.com/uploads/1/3/4/0/134041620/lovetomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380699/normal_5fdac99315dfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_600f224ca5028.pdfIn PDF document text
    • https://malibuvebejonab.weebly.com/uploads/1/3/4/5/134524684/kagerorevab-jikapesanipeto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449627/normal_601bb6350d7e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447884/normal_60331bdedb72d.pdfIn PDF document text
    • https://linekepev.weebly.com/uploads/1/3/4/0/134041162/begebu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480148/normal_5ff919ba0d47b.pdfIn PDF document text
    • https://gepogixuzusesil.weebly.com/uploads/1/3/3/9/133999736/ximafovivi-rawipapipawukab-vafiwekulaj-pivanukopanuxa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/85eb8fe7-1705-46cf-8d64-3ceca60df0a8/kologerusibivumavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd046daa-70a0-4df2-9fb7-e0a98562c241/23209156643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0650881-565e-40eb-a18f-5ebfe7b09930/have_the_courage_to_be_disliked_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1de09d1-a065-45b7-884b-d757fde19379/zarorizuxokewet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e74d84a8-8272-4a0b-8f2f-01ccae9918d4/93784455681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6009c6d7-1b25-4104-a914-e02d8bf72753/bulldog_stencils_pumpkin_carving.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/886f6fa8-f2b5-49b4-86a5-dab4b98029b5/sujizelabirij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb03779b-f5f2-4c2d-8c82-58b80e8e64e8/when_can_you_use_a_baby_heartbeat_monitor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd24e495-01ee-452f-a478-06b43a5e80d6/maths_worksheets_for_7_year_olds_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c632d8e2-edc1-48ab-8b3d-f10ccaf133a3/grand_theft_auto_san_andreas_remastered_version_pc_download.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_off0000d239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD239 4600 bytes
SHA-256: c322d5cd137d4ed36ed97d3af49faf13258c51fbc0559289b3c364b1436aad84
font_01_sfnt_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 10140 bytes
SHA-256: b4849b08a5dd40704a46173656d4b6470d3278a6d59c8737ba2382e90aee3d0e

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