Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cab4c86087b01ff…

MALICIOUS

PDF

79.0 KB Created: 2021-03-01 01:53:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3abb6ec269e6e9f05f04e3a53566d13e SHA-1: 091d261ebf9c76c461799e88a380a7e9840d0c7d SHA-256: 0cab4c86087b01ff315b8c9eb2a224dbaa517734fbe9fd053d6edf62a91c3d34
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious 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://golowaki.ru/award?keyword=kayla+workouts+pdf PDF link annotation
    • http://rijewomel.scienceontheweb.net/38532919853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422908/normal_60167657de5a0.pdfIn PDF document text
    • http://glossywp.online/nisil5xdcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403541/normal_60072b1b4b8a7.pdfIn PDF document text
    • http://hookup153.site/dudofemuworonexv6h.pdfIn PDF document text
    • http://herss.space/gezisejosupuvotzkgj.pdfIn PDF document text
    • http://fitokapss.xyz/tilabolabibarorubuwawodedp41y.pdfIn PDF document text
    • http://bionatur.space/48523508913l4r15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381287/normal_6003eb5d3ad93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5fe762edc9c24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463794/normal_5fcf1e351ed4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409604/normal_6013b31555c46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_60314f3893f97.pdfIn PDF document text
    • http://rasprodavaika.ru/mowinolo46wo4.pdfIn PDF document text
    • http://vashobereg.com/lowol74kol.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://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_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 4872 bytes
SHA-256: 07e29ef0eb51975360336c8fae49ac4a6d692ba4556eba20c3cded91bca0f693
font_01_sfnt_off0000fbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 10796 bytes
SHA-256: 8692b3679fbf3d8673921b0e6e9a2ad7bb9c38e7264996bcf76820dc47f7d6e8
font_02_sfnt_off000120ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120ED 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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