Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31e78dee51b2f28…

MALICIOUS

PDF

72.2 KB Created: 2021-01-19 07:26:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0cde92c01b09cfa327a90c7a5b42427a SHA-1: 17f8827fdf54076a1607bc7a4ae0ce660c3769b9 SHA-256: f31e78dee51b2f288b2e529e6469de153f1115181121c33c6848450039c85928
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external URLs, with one specifically identified as part of a link farm designed to redirect users. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

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
  • 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://leonvi.ru/wb?keyword=strafe%20esports%20android PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487416/normal_5fddaede4396a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5fc6a613c4273.pdfIn PDF document text
    • https://cdn.sqhk.co/buzivafulet/5ektF6z/22060683603.pdfIn PDF document text
    • https://site-1166675.mozfiles.com/files/1166675/duvomabezozowomirowurazip.pdfIn PDF document text
    • https://site-1173429.mozfiles.com/files/1173429/fortune_cookie_maker_game.pdfIn PDF document text
    • https://site-1249599.mozfiles.com/files/1249599/healthy_habits_esl_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473642/normal_5fb2c7dfa34c0.pdfIn PDF document text
    • https://site-1175914.mozfiles.com/files/1175914/larissa_90_day_fiance_police_report.pdfIn PDF document text
    • https://bexizesuxeneze.weebly.com/uploads/1/3/4/6/134634073/muligalulaxo-baxekojutozemud-gazeke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5f911c7b88fa8.pdfIn PDF document text
    • https://site-1174180.mozfiles.com/files/1174180/cartoon_network_app_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5f8c2a488c35c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://befojarariwowab.epizy.com/7437467593.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_off0000ddfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFA 5108 bytes
SHA-256: 4cf1c119b5cf32d6daaef0d21650aaea9a690ec0e26ddbb091cfca88333315b3
font_01_sfnt_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 10884 bytes
SHA-256: bfc0bcb346e24cf94879fe40dca01d463657915a31c287d26f44310a244098d1

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