Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6898bafe0b84f88…

MALICIOUS

PDF

84.6 KB Created: 2020-11-17 00:18:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dd6339914912d0e6a663a8e6cf6900b0 SHA-1: dbefe6604500e7ea1d0a2de8bded88277462121d SHA-256: a6898bafe0b84f8839813dec14e91567015ee081f85db75cf25e4b97157b0479
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=skyrim+konahrik%2527s+accoutrements+how+to+start In PDF document text
    • https://dolufuweg.weebly.com/uploads/1/3/4/6/134626051/ganuti.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/8558808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_5f9b63d045538.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/zesisawexosalezala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5f88f3681cc6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_5f9939ef903c9.pdfIn PDF document text
    • https://tibirodemoxojuf.weebly.com/uploads/1/3/4/3/134336787/xokan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/98401395914.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/format_sd_card_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/97430376958.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/angularjs_advanced_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/android_phones_for_sale_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad72eb6c-6b07-463e-b134-853ba0f7e8f3/lmfao_party_rock_anthem_download_320kbps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3a5cfbb-69d2-45b3-8d20-bf957980b746/neufert_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/33303031466.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000117c5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x117C5 25724 bytes
SHA-256: 31b0896b0f64b82acc15bdb46fa28fd3847f935eb90bff587558ef990a17b16a
font_00_sfnt_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 5404 bytes
SHA-256: c05ffc6ffab98968dfc3acccc392883c0cdb69204540c0547e36136cae35f33f
font_01_sfnt_off0000f261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF261 10916 bytes
SHA-256: f477012c21940d0844985f1f72ccef8f3f63f58a988e953d26c915661663129f

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