Malicious PDF — malware analysis report

Static analysis result for SHA-256 26da0c63618d1ff8…

MALICIOUS

PDF

76.9 KB Created: 2021-02-25 02:26:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 25c78177e1f93289470741f1b406b167 SHA-1: 2d0f511658978e30caecee10e292a3db1c5287bb SHA-256: 26da0c63618d1ff88d2f6a291db0a80915c7d4f89c2c11db60010e047aa646c8
184 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to external, potentially malicious websites, likely for phishing or further malware delivery.

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 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.
  • 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://yafferge.ru/wix?keyword=master+of+the+shadowlands+pdf+indonesia In PDF document text
    • http://wivaserana.mywebcommunity.org/how_to_clean_bissell_proheat_2x_revolution_brushes.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/c09bdd8.pdfIn PDF document text
    • https://bukivobiwizu.weebly.com/uploads/1/3/4/0/134097020/baruvifukojigufojobu.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/87587261331.pdfIn PDF document text
    • https://lekakuvikel.weebly.com/uploads/1/3/1/3/131380005/suruwapuxesibug.pdfIn PDF document text
    • https://depewezuluro.weebly.com/uploads/1/3/4/1/134108544/355500.pdfIn PDF document text
    • https://bumopajuri.weebly.com/uploads/1/3/0/9/130969054/buzobuwibi.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/33030340480.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/wazorixekunafob/android_layout_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/jukevitezokotegosag.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/family_finger_puppets_template.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/drug_information_handbook_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/barso_re_megha_megha_song_video.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/u._s._infrastructure_report_card.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 5224 bytes
SHA-256: 1ae61cc9dd1045f25b9d8b1d0b08ec2c57bfa230645efedce06b91641d1bdd31
font_01_sfnt_off0000ee6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6C 10252 bytes
SHA-256: 562b8a7f2b29129ae41d3c2ad3bccc57e1764230c47c8b801d36b19eeac176d7
font_02_sfnt_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 16060 bytes
SHA-256: 5bd88bd5c44eb894b151ed33ba27cda91e6b534aa93a3b288c9f525c64baf622

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