Malicious PDF — malware analysis report

Static analysis result for SHA-256 970f50a3f90926b5…

MALICIOUS

PDF

83.0 KB Created: 2021-03-25 10:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: befd374c319543a740a2f84764d98ebe SHA-1: b0a2eac1d9f97c4206c6652148ada235f0601f42 SHA-256: 970f50a3f90926b5798a3886ba89fba1ab138438990971423ae8bb821034b39c
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains an external URI pointing to 'https://seumenha.ru/strik?utm_term=is+prius+expensive+to+repair', suggesting a phishing or scam attempt by luring users to a potentially harmful website. The PDF also exhibits characteristics of a link farm on disposable hosting, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://seumenha.ru/strik?utm_term=is+prius+expensive+to+repair PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413583/normal_60410887a3fc6.pdfIn PDF document text
    • http://pipvip.ru/romeo_and_juliet_play_by_william_shakespeare931ho.pdfIn PDF document text
    • http://jaxifas.getenjoyment.net/62225481997.pdfIn PDF document text
    • http://sovumeriwox.mygamesonline.org/description_text_structure_graphic_organizer.pdfIn PDF document text
    • http://pusosokus.iblogger.org/40697559917.pdfIn PDF document text
    • http://rowomonug.mywebcommunity.org/what_does_taco_bell_mild_sauce_taste_like.pdfIn PDF document text
    • http://se-mrush.com/34665488446wkmyc.pdfIn PDF document text
    • http://opticsystem.website/short_stories_to_read_to_someone_who_is_dying4ea19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460071/normal_5ffdfe70b7abe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446168/normal_5ff6d18c22913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_60500f1674be6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476268/normal_60348ae892bff.pdfIn PDF document text
    • http://tells.fun/xevifaligazu5wz8r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_2e85f438e3d94229937cba739468d5ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/bohemian_rhapsody_violin_solo_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/buvuwikogazepitekawel.pdfIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_ba431e0994e04d1ba0e486a8fa9f931a.pdf?index=trueIn PDF document text
    • http://xugidujesu.epizy.com/bafus.pdfIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_87009122f6e24bff8afef61f3c820ab9.pdf?index=trueIn 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_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 4728 bytes
SHA-256: a556fe7e1ddf31b8a2aec0f18823948896f34fd3658bf88c3bdbb628825f8fd1
font_01_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 10940 bytes
SHA-256: 9432ba8f11633bbae2a48efd96e7f8de664b5e47a39b630605903ca79e8709a6
font_02_sfnt_off00012f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378