Malicious PDF — malware analysis report

Static analysis result for SHA-256 e86587ecf1e77f3a…

MALICIOUS

PDF

70.9 KB Created: 2021-03-25 12:04:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b47518d5e24d2d1bc4eb249a94c82ff9 SHA-1: 0f26e75e9a671a9b8cc0fe39494575052f79d01a SHA-256: e86587ecf1e77f3aa59667961ba3e71e0a1e65caa4bca8d72c3aa331c4822ade
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for link farms used to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/award?keyword=auxiliary+view+drawing+exercises+pdf PDF link annotation
    • http://imm-shoes2.club/686017114750qfe6.pdfIn PDF document text
    • https://nopiviwefimak.weebly.com/uploads/1/3/4/7/134708781/9067438.pdfIn PDF document text
    • http://lesantyqas.online/77425116915eu9cu.pdfIn PDF document text
    • https://befawiboper.weebly.com/uploads/1/3/5/3/135389238/wakenemuriti.pdfIn PDF document text
    • https://posenumu.weebly.com/uploads/1/3/0/7/130776111/worujujavigal_tadagalawodiri_jabokilabet_nuwubonap.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/the_wind_guides_you_shrine_zelda56cua.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/173b6245-965b-4980-be63-60668f4f7972/nagopufuwokevorez.pdfIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_cd1cf0485d264e93855d4e1ee362ef1d.pdf?index=trueIn PDF document text
    • http://wokikeka.epizy.com/sanevup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99292c34-a9fc-45e2-ad2a-4b750614486f/spanish_essential_oils_desk_reference_6th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e40ac750-738e-45c6-be51-fb3df5f8803b/sonic_corn_dog_calorie_count.pdfIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_a96895231de94c058eee0cc49043e0c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/minecraft_1._14._3_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd09ba43-12af-4d9a-a327-fe3692c25779/rusezuzivozofe.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/pukin.pdfIn PDF document text
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_a22d064d410c4e39a66b2e53c210c870.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/28523864008.pdfIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_c74b50632a7c41629b77ca9f65a6a278.pdf?index=trueIn PDF document text
    • http://velupar.epizy.com/88858938529.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_off0000d768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD768 5632 bytes
SHA-256: cf0d7ef5503ed0d3c71484d14e9a6e21717ce48ba63d2d1f0a6e4a44bae8436e
font_01_sfnt_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 9860 bytes
SHA-256: 080577d29d2ae1cccfb5c7075543e551d5a7a52471c3f6ae19fd09449595c3ea

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