Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a73543d67b01c10…

MALICIOUS

PDF

89.0 KB Created: 2021-03-03 13:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: fa68785c30bcb5b375f95e39881f7fbf SHA-1: 42706c2520a4d3a3939df6e74be39f70d77e7826 SHA-256: 0a73543d67b01c109e2dc31a0b0a85dbb585b075d94549533d3d441b12b4669c
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, many of which are SEO-themed. One of the primary URLs, https://jottigo.ru/strik?utm_term=the+fisherman+and+the+jinnee+pdf, is likely part of a phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed 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 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.
  • 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://jottigo.ru/strik?utm_term=the+fisherman+and+the+jinnee+pdf PDF link annotation
    • http://nimened.66ghz.com/dekiwuzavipajepux.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/ijhhNuM/mejesolazegabiselokip.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/ji6jijc/gagododazizubibefuv.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/8544834.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/jf7ia1t/switch_lite_black_friday_walmart.pdfIn PDF document text
    • https://pagafamowadaf.weebly.com/uploads/1/3/4/8/134878907/864113.pdfIn PDF document text
    • http://zonixutazexe.iblogger.org/76586201063.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/timeziso/cheliya_cheliya_telugu_song.pdfIn PDF document text
    • http://pamemoroza.epizy.com/34740899158.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/li_ning_company_limited_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/59467152300.pdfIn PDF document text
    • http://sabinozugi.epizy.com/45057897844.pdfIn PDF document text
    • http://bajipodi.epizy.com/88005179673.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/sewisovorefavagubadisakup.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/dovew.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/corrugated_metal_sheets_galvanized.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/ancient_chinese_chariots_answer_key.pdfIn PDF document text
    • http://rabibunipidozok.epizy.com/vojoneniwi.pdfIn PDF document text
    • http://bofumegudatoxos.rf.gd/twitter_template_free.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_off00011850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11850 1644 bytes
SHA-256: 1e8a8a0fa1f092d070f3d135f95cfe16f87eb5a8708dd3712317bebb8096d10c
font_01_sfnt_off0001208a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 5272 bytes
SHA-256: 29b96ffa17daf71bb5ddcb8dae77854e3bb5d654f6c3aa5a630e952ed1d659a8
font_02_sfnt_off00013253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13253 10468 bytes
SHA-256: 1c81f6afcbf6f04d25353446db9d0980ad2c21e90215ac2f3129381754bab4f7

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