Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef61c6f58945b0db…

MALICIOUS

PDF

74.2 KB Created: 2021-03-23 15:06:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e97cdddc720e02ea5cd712696c8c8e4 SHA-1: 1452af676687b36af5dcce51a68286998d16ec5e SHA-256: ef61c6f58945b0db2c80e50b6742ce1dc2edacbadadbb45e693afa2129111fe0
156 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are used to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=secrets+of+body+language+video+questions+answers
    • https://waxogisuges.weebly.com/uploads/1/3/0/7/130776632/mirowewur.pdf
    • https://dolilifiwu.weebly.com/uploads/1/3/4/4/134401054/1a83e5a.pdf
    • https://cdn-cms.f-static.net/uploads/4414691/normal_602f6c22a3b5a.pdf
    • https://cdn-cms.f-static.net/uploads/4451941/normal_6036d436bd22a.pdf
    • http://pabakijizozid.iblogger.org/52964945105.pdf
    • http://cheapkeys.site/mesajobuvogexujije6xsm8.pdf
    • https://cdn-cms.f-static.net/uploads/4462374/normal_600c98cb74300.pdf
    • https://static.s123-cdn-static.com/uploads/4486745/normal_5fcb69c05865a.pdf
    • http://abanca-electronica.com/gelafakexuxidoxetafy3l.pdf
    • http://rijesukedad.22web.org/gafomujefibuti.pdf
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/poxililejixaw-balabonaneleja-togusi.pdf
    • https://bedejoxinen.weebly.com/uploads/1/3/1/1/131163540/233668b5c90fb9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_df3f12d49786454597dd03c71a6462ef.pdf?index=true
    • http://fazetotunoju.epizy.com/animals_information_in_english.pdf
    • http://dubabin.rf.gd/bahubali_1_video_songs_in_telugu.pdf
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_3a1eeabf9d564d69878c676d00b7bcd3.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e323.bin
92db8859461bf56610b3e0fcc439ecc9a599940575cf54fd02b6df886288374b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 5812 bytes
font_01_sfnt_off0000f70a.bin
11068482692e70adbd1ac660fcffed47f2b8ac53379abd2f8044643d16f2048a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 10904 bytes