Malicious PDF — malware analysis report

Static analysis result for SHA-256 22627d3b6f96e89a…

MALICIOUS

PDF

83.2 KB Created: 2021-04-14 03:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a63a1401488a89ae339414a59b4bc4d5 SHA-1: 7d85010427e9cef62ae9061c3af43e15a050b0c8 SHA-256: 22627d3b6f96e89a686815313531190a197f6835560d8eef6b2a9bde57828859
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The heuristic firings indicate the PDF is designed to link to malicious infrastructure, likely for phishing or malware distribution. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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://dafemum.ru/strik?utm_term=how+to+smoke+a+brisket+in+a+smoker+youtube In PDF document text
    • http://rowaxamapitowej.getenjoyment.net/1944135499.pdfIn PDF document text
    • http://gilumesu.mypressonline.com/39048372576.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/femum.pdfIn PDF document text
    • http://totaxusozavu.sportsontheweb.net/lepomuv.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/tiwuzamagox.pdfIn PDF document text
    • http://ragofilud.medianewsonline.com/american_gods_script.pdfIn PDF document text
    • http://vijepuwobewi.mygamesonline.org/21591122445.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/sirozokojedodobu.pdfIn PDF document text
    • http://gebikomuxe.getenjoyment.net/45275402848.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fojakosi.atwebpages.com/60431377780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc7db6a1-5ce5-4acd-a8f7-03862c3d55bc/19876575860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aedf913c-f5f7-442e-8160-228b15223c33/pogil_22_phylogenetic_trees_answers.pdfIn PDF document text
    • http://wurebosuloxu.myartsonline.com/leruvafulemutirovezimel.pdfIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_9d6217d6e55c4156b2acaf21c32cc729.pdf?index=trueIn PDF document text
    • http://rabatelekovufar.myartsonline.com/agonistas_y_antagonistas_dopaminergicos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cde2129-0770-4af8-aef6-cb20d8c1d577/30366443072.pdfIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_ab1c95c9af584aa2b0271bae0c3b49cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/be903d15-3421-4fee-bd86-b2b454f96ba1/92037000659.pdfIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_78fdf2b280fc4f2ab7ed6c7c487ae163.pdf?index=trueIn PDF document text
    • http://sufixis.myartsonline.com/fimozavozemi.pdfIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_c4177b988691416f8ea016f9e691d3ec.pdf?index=trueIn 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_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 5160 bytes
SHA-256: 62342fc6e1841c3f8d41928f0f048d9d5a7d248e568af61e385274205719ecd3
font_01_sfnt_off000118f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F9 10808 bytes
SHA-256: 4981f5decc4abb27d37a761762060384760241a5c404eb7cb33e90a9a6a25cd2

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