Malicious PDF — malware analysis report

Static analysis result for SHA-256 50dff7724ed80741…

MALICIOUS

PDF

74.5 KB Created: 2021-02-18 13:05:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5dd0d587c991986d6cdcecebf98fb21e SHA-1: 66cfebc8a969dd8348e86b8b1864b5412ca06c35 SHA-256: 50dff7724ed807410bf23a5b5e6ec7decf742914d6eacb01072e12c4d2b15f99
154 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a critical finding for a PDF redirector link pointing to 'https://yafferge.ru/123?utm_term=do+military+get+federal+holidays+off', which is a strong indicator of phishing or malware delivery. The embedded URLs and the nature of the PDF content suggest an attempt to trick the user into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/123?utm_term=do+military+get+federal+holidays+off In PDF document text
    • http://healsmall.space/a_thousand_years_christina_perri_mp3_downloadsmwwg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366358/normal_5fcdfe390e5ab.pdfIn PDF document text
    • http://vir-tus.com/798731400362p7qx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422897/normal_60094551e9fbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5fd660a8aee02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386366/normal_600edc1a34311.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489441/normal_5fe3f20760806.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475212/normal_5ffc6be9b5ba9.pdfIn PDF document text
    • http://chelamela.org/kevuzerolorojixupasi8cpsg.pdfIn PDF document text
    • http://italia-doc.space/vertigo_movie_poster_designerkrv4b.pdfIn PDF document text
    • http://merovew.xyz/vipazelalojasitoxerorepu2qegv.pdfIn PDF document text
    • http://ru-payment.casa/43352326969s8hsm.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/ganubatebedoxez/baahubali_2_tamil_full_movie_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/74586526331.pdfIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/game_god_of_war_psp_emulator.pdfIn PDF document text
    • http://resutujimi.epizy.com/how_to_reconnect_my_viper_remote_start.pdfIn PDF document text
    • http://tuguwobafadurot.rf.gd/70753274563.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/kojul.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_off0000e61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61C 5424 bytes
SHA-256: 98a4807c6774152ef155d18fcd62609b9a3524a14637781392344b1708e5c8d0
font_01_sfnt_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 10660 bytes
SHA-256: f594ea42e25a901f9d7d9a88e891598d56ee5286f3f6e32c9b87db91c2dd150b

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