Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13826ff17f432f2…

MALICIOUS

PDF

73.5 KB Created: 2021-03-01 02:19:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 79eb6198ec7a43bb9ad534027ae83951 SHA-1: f81ff58fc3a5b344afc07455fc46ff688d59b85e SHA-256: a13826ff17f432f27162f77c7868c1c40561628a874a1978df5531849a3a4fa5
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farm heuristics indicates a strong likelihood of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://nipisod.ru/wix?keyword=fools+crow+wisdom+and+power+pdf PDF link annotation
    • http://retenenu.iblogger.org/milod.pdfIn PDF document text
    • https://memuvarava.weebly.com/uploads/1/3/1/3/131384606/simelexase_funewinu_vagebojogunese_bopuluvatubate.pdfIn PDF document text
    • http://kewegagibemidaj.22web.org/lonely_planet_indonesia_guide_book.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/7Agd9jh/zuponirewidezukumese.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/miledu/brackets_for_kali_linux.pdfIn PDF document text
    • http://delupujak.epizy.com/28031813694.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/botivekun.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/towujanunuzafosaluboja.pdfIn PDF document text
    • http://kakapefetabol.rf.gd/59406354214.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/type_writing_font.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/credit_report_singapore_free.pdfIn PDF document text
    • http://vewajelawukos.rf.gd/solaredge_55kw_inverter_datasheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65B 5056 bytes
SHA-256: 56399972bb759acfe2470b5dbac3bcb1f74baeeae96f234e1e80c9f3e6149362
font_01_sfnt_off0000e777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 10504 bytes
SHA-256: ed0150fc0e657768ec5f1ff2183621b1ccd2469941624feee38f6296c14f5880
font_02_sfnt_off00010b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B82 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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