Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9a6acc3408b55d…

MALICIOUS

PDF

76.8 KB Created: 2021-02-20 18:59:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: caa8ac628c493604b4d56081633b1d33 SHA-1: 44211e9a1ab2af3ea382a8f6c69e6291d04d9339 SHA-256: 4a9a6acc3408b55db5e98686f7b81500aea2352870df9347b0dca7223e7f8457
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, including one pointing to 'leonvi.ru' with a keyword suggesting a search lure, and another to 'cdn.sqhk.co' which is part of a link farm. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://leonvi.ru/wix?keyword=krups+xp1500+manual PDF link annotation
    • https://cdn.sqhk.co/jawutuwek/fxiiKjb/molux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495395/normal_5fd9f2d0d8b5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497687/normal_5fffbc2c0700f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473632/normal_5fec0469d218e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405644/normal_60195649013a4.pdfIn PDF document text
    • http://liolika-rsya.ru/panasonic_sa-pt750_wireless_speakers_not_working1mo99.pdfIn PDF document text
    • https://fibukumaguwin.weebly.com/uploads/1/3/4/7/134770434/juzivosim.pdfIn PDF document text
    • https://ditomivowulute.weebly.com/uploads/1/3/4/6/134679561/sufobatuzadusaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_5fd9187e98df2.pdfIn PDF document text
    • https://giwuvapelefawi.weebly.com/uploads/1/3/4/8/134869604/d9c7cd26110.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/hgWghbc/23982346194.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/rerinago/mallee_catchment_management_authority_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/18237684695.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/xelaroralipa.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 5320 bytes
SHA-256: 7261c0f9deddfee7563f3d17b8c02de705ae635c5fcb62a212fde2f208cec4a5
font_01_sfnt_off0000f1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B6 6508 bytes
SHA-256: e79e2d75558a361d46f511aba4f8c532eaa4fe6c9d91436f6a8d2d1614ded34d
font_02_sfnt_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 10240 bytes
SHA-256: 8ab31265cb63f1d3e45640eef39bc93167c0289023adba5987ce4eb260490057

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