Malicious PDF — malware analysis report

Static analysis result for SHA-256 9200f64426f0e8ec…

MALICIOUS

PDF

86.0 KB Created: 2021-06-07 21:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c20a3c9e37e270c99b9b5e8254657df4 SHA-1: 26607271bd89c4b42f9595d53bba63ddff94a13c SHA-256: 9200f64426f0e8ec3f7e3339c2b76089c8feac5aa6389618bf27938b8fb8de9e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malicious content through these links. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://pistant.ru/pbw?utm_term=a+christmas+carol+quotes+and+analysis+stave+4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485695/normal_60be2ccd5abc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449793/normal_5fd118a7417bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425723/normal_5fdad07c1b890.pdfIn PDF document text
    • https://loturevigud.weebly.com/uploads/1/3/1/3/131378985/7444a84bbd.pdfIn PDF document text
    • https://malinozibide.weebly.com/uploads/1/3/4/3/134380659/wosuj_lokixad_wofot_mujolagebizurob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401971/normal_6051038f98b88.pdfIn PDF document text
    • https://fojaxusulilunud.weebly.com/uploads/1/3/1/3/131381134/nerowubano.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://furalagaposu.pbworks.com/f/wapaworibojina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18a5db9-ce93-411c-a48c-11df71a410d2/fight_club_chuck_palahniuk_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afdfdcd2-6742-4f79-9970-5534739748e5/sandisk_sansa_clip_zip_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac737013-b519-4435-9290-0e389f34c656/restful_web_services_complete_tutorial_java.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/530e1696-c7a7-4ac8-9629-541a283a74e3/do_trimmerplus_attachments_work_with_husqvarna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0369d42-f69c-4345-8f7e-0035b92af5e2/fifomiv.pdfIn PDF document text
    • http://pobonagul.pbworks.com/w/file/fetch/144463443/17199514333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fbaad33-10d7-4150-82ff-0d93e8ee43b0/how_to_clean_a_jandy_ei_salt_cell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dae02d8-2234-4672-bfa5-2f81a934df29/2193144497.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_off000111ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EF 5544 bytes
SHA-256: c4b65edd7c1859c5f87a7becec26167ef9d3c859eef4b0a391150f6fd8fa8471
font_01_sfnt_off000124ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 11268 bytes
SHA-256: 0712314aa8f2e7c2fa46134bd4755f672fdc1d628f445fbfffee2ade20914e06

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