Malicious PDF — malware analysis report

Static analysis result for SHA-256 503e7730f89d8fae…

MALICIOUS

PDF

76.5 KB Created: 2021-02-28 21:22:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6a55491cd63952894355cd8003ed6f86 SHA-1: ae9dc504dfc63f9f00bedc2a6967781c767ec74d SHA-256: 503e7730f89d8fae728177f2850e5b694ef8ba806a86c10d8c6066a4944e86e3
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are indicative of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The primary malicious URL identified is 'https://soxebez.ru/award?keyword=jorge+luis+borges+sus+obras+mas+destacadas', which is likely used to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://soxebez.ru/award?keyword=jorge+luis+borges+sus+obras+mas+destacadas PDF link annotation
    • http://unityfree.xyz/android_developer_settings_shortcut5sckz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379483/normal_5ffaa5c068caf.pdfIn PDF document text
    • http://imedo.ru/android_oreo_version_freecwgz4.pdfIn PDF document text
    • http://myfirstsite.xyz/the_secret_life_of_the_american_teenager_season_3_episode_11_casteei8p.pdfIn PDF document text
    • http://funseeds.site/cbt_workbook_free_downloadvpj8c.pdfIn PDF document text
    • http://ontrade.top/816081884405j6ts.pdfIn PDF document text
    • https://tunorikiwevog.weebly.com/uploads/1/3/4/0/134097136/fd81d8eff2874.pdfIn PDF document text
    • http://icily.xyz/pixipulozifanpssr.pdfIn PDF document text
    • https://rigonabex.weebly.com/uploads/1/3/1/4/131483185/8598265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454824/normal_601c6a5697370.pdfIn PDF document text
    • https://cdn.sqhk.co/sejiragidu/dhdMiTq/loxetovug.pdfIn PDF document text
    • https://zupuluduwiwafop.weebly.com/uploads/1/3/2/6/132681460/segidanumo.pdfIn PDF document text
    • http://life50it.pro/bayliner_175_extended_swim_platform6ud99.pdfIn PDF document text
    • http://micrometer25bill.site/1052803927453kvs.pdfIn PDF document text
    • http://genoray.pro/87970399115psefb.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/gojupatuji.pdfIn PDF document text
    • https://xesudubivutomu.weebly.com/uploads/1/3/5/3/135303490/zuxarevufuvipal.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/kezemiradigu/morning_and_evening_duas_al-huda.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_off0000ead2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 5388 bytes
SHA-256: 4395235f3d4ef1f80aecae36d62c49531baf19a8be4d4555165c27c29e3c75bb
font_01_sfnt_off0000fd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD07 11752 bytes
SHA-256: ea7f8207125d37a40094e27625ac13b04ce6708d8b6e763ea8e5bc1cbad431fb

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