Malicious PDF — malware analysis report

Static analysis result for SHA-256 81cfd65c00e0ae3c…

MALICIOUS

PDF

79.7 KB Created: 2021-03-07 22:53:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2d23ca215944188ff7336cf530bcafa0 SHA-1: 56c7aef4a5f6386dda249650b983218fcfcf37a7 SHA-256: 81cfd65c00e0ae3cc88c0389345889afc3655ed6f2457fef89d26de3a2fc8fd8
186 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. It contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs point to various domains, including 'jumiwimov.ru' and 'baxezakeva.weebly.com', which are likely used to redirect users to malicious content. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://jumiwimov.ru/strik?utm_term=automation+production+systems+and+computer-integrated+manufacturing+4th+edition+solution+manual PDF link annotation
    • https://baxezakeva.weebly.com/uploads/1/3/1/4/131406046/1906e80fec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377401/normal_603a71ad735e6.pdfIn PDF document text
    • https://cdn.sqhk.co/jofijoju/NkSiiHn/okay_gif_cartoon.pdfIn PDF document text
    • https://vowebaxuzifov.weebly.com/uploads/1/3/0/7/130738870/3709578.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/6b3NDG5/dagasaviwoga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_5fd64b961cc66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530036/normal_5ff5fafb38c15.pdfIn PDF document text
    • https://lanoxujuzon.weebly.com/uploads/1/3/4/6/134630121/6737593.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/cKqidhh/pacman_arcade_game_walmart.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/8877843.pdfIn PDF document text
    • https://cdn.sqhk.co/mitejapeki/dgeibij/oneplus_7t_round_icon_pack.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://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_eda08b5ed1c24e50ab0319f8d5f7e917.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f39e708-d2f7-4346-be28-cf380fe32a57/kokidegexideruf.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_905ec6363b8a483c90a346656e4ed87b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a401a88-ef27-4dca-ae30-f612872c4c12/how_do_i_love_thee_poem_form.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/pediatric_gastroparesis_guidelines.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_5d30db31f9f548edbebbcf882f022457.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49a1da7c-1359-476b-a483-85d8c0f2fc0f/dometic_ac_troubleshooting_guide.pdfIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_66df3d7435ea47d08bcc81a68a515d2b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/game_psp_emulator_android_gratis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF7 5660 bytes
SHA-256: 22d2467b8aa1b1ee1bb8cda987c77fb5e73616597d4c8372958ee15479b9f359
font_01_sfnt_off0000ff14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF14 10248 bytes
SHA-256: 817a5e6e37fde3e2965cf03755e3b1527de1441febc57fdfc0de48f2b8a662b0
font_02_sfnt_off000121ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EC 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34