Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f80badb06a1f76…

MALICIOUS

PDF

77.5 KB Created: 2021-03-28 23:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b67e72f9606da889379e1d8d2fe78fa8 SHA-1: 2046b0cdb0432afef072058bde73b491166ffadd SHA-256: f9f80badb06a1f76348562ee054a77a76aaa274399dc212023134e6443f9f1b7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://xajibur.ru/wix?keyword=mujeres+lenguaje+sexista', is directly embedded and likely serves as a lure or part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://xajibur.ru/wix?keyword=mujeres+lenguaje+sexista PDF link annotation
    • https://cdn.sqhk.co/fabetojowuje/jfibOuN/68070879256.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407562/normal_600559e73d1c8.pdfIn PDF document text
    • https://desotidibig.weebly.com/uploads/1/3/0/7/130775813/vekowa-radezexon-gikupuxezelos.pdfIn PDF document text
    • http://xasanok.iblogger.org/boarding_pass_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_601d305ea275a.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/r8hfqie/free_printable_meal_plan_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494440/normal_6027a5dd3c607.pdfIn PDF document text
    • https://wadasowodasi.weebly.com/uploads/1/3/5/3/135316150/giziva.pdfIn PDF document text
    • http://xoxugexoxafuwet.iblogger.org/devil_take_the_hindmost_def.pdfIn PDF document text
    • https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/zenifi-bifosojuvosi.pdfIn PDF document text
    • https://dorulitonen.weebly.com/uploads/1/3/1/3/131380258/26ec3b101b0e0db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xefukogan.rf.gd/bopiriri.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_1d7d770e01e44277acd3773c2430b00c.pdf?index=trueIn PDF document text
    • https://d650f791-4ca6-4964-96f1-ba9fac0414c1.filesusr.com/ugd/adf9cb_f6dcfc7cc879493d849199fcc227cce0.pdf?index=trueIn PDF document text
    • http://lebozid.epizy.com/ode_to_joy_piano_sheet_music.pdfIn PDF document text
    • http://xesujenomudot.epizy.com/28982553150.pdfIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_82400fb6a36a400491e45febbd99f2a2.pdf?index=trueIn PDF document text
    • http://sasunuvelew.epizy.com/chess_learning_books.pdfIn PDF document text
    • http://wexalaz.epizy.com/cutaneous_leishmania.pdfIn PDF document text
    • http://bukujinelekoxi.epizy.com/22989770689.pdfIn PDF document text
    • http://jojapup.epizy.com/nazudurisij.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 5000 bytes
SHA-256: 58f291bcbb32aa3118a1cf74aabc31ed730e7cfa52fca933c505be1bcbdaaf1a
font_01_sfnt_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 12076 bytes
SHA-256: 47f0bdd9430c74ba8c694afadcc6afc75dc8078fc7fc49effecc27c1b904c443

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