Malicious PDF — malware analysis report

Static analysis result for SHA-256 3774e913adfa19c8…

MALICIOUS

PDF

77.0 KB Created: 2021-05-07 12:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bfb449f36ffdce49146efd24c3398baf SHA-1: cccce4af1cad556eafbd38f947ae686b27cf8e56 SHA-256: 3774e913adfa19c892c214aac850f9cd82f75b6fe4ef48b8d4736213f7508212
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://baarspo.ru/strik?utm_term=what+is+the+legal+system+uk PDF link annotation
    • https://sopunarexij.weebly.com/uploads/1/3/1/8/131857112/8c6011cbda1f78.pdfIn PDF document text
    • https://medisavepa.weebly.com/uploads/1/3/0/8/130815026/7746477.pdfIn PDF document text
    • http://xegevapu.iblogger.org/4th_grade_math_common_core_practice_test.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459636/normal_6064372c48f53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5fd09d8217678.pdfIn PDF document text
    • http://mubalupuzapo.22web.org/25340702251.pdfIn PDF document text
    • https://gopilabuvimira.weebly.com/uploads/1/3/1/4/131453416/rosajuva.pdfIn PDF document text
    • http://pemokel.iblogger.org/47426274406.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lujevetanulo.epizy.com/26491122331.pdfIn PDF document text
    • http://zalaxorenisev.epizy.com/bjarne_stroustrup_c.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/ecommerce_template_html_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/dashboard_web_design_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/76188737196.pdfIn PDF document text
    • http://pugunefa.rf.gd/22262902032.pdfIn PDF document text
    • http://kuvofefifowojop.epizy.com/annotated_bibliography_mla_8_format.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/21_marvel_movies_to_watch_before_endgame.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/69296581547.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/behne_de_song_mr_jatt.pdfIn PDF document text
    • http://tibupud.epizy.com/bovee_wma3000b_android.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_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 5184 bytes
SHA-256: ebab574a0761de822e09b3d4b7cc5d4e057978d7e5526a0e768d9013ae22021e
font_01_sfnt_off0001025f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025F 10808 bytes
SHA-256: 8e87e3410098007356cb4adbedadbb909bf2525c52eaf0b0fe82379ef8dd38fc