Malicious PDF — malware analysis report

Static analysis result for SHA-256 742dab00abc46d2d…

MALICIOUS

PDF

75.9 KB Created: 2021-03-07 10:50:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2ff15893b0099d7e4f24db3c41784e56 SHA-1: 2cfbab2574db8eadd7aca8b21703189f70d0afe3 SHA-256: 742dab00abc46d2d65dcf79e21e971ff69c3177711c6ae69b95f035cd5fe1ea8
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to external PDF files hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, and the ML classifier strongly flagged the PDF as malicious. The ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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.
  • 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/wb?keyword=how%20we%20survived%20communism%20and%20even%20laughed%20audiobook In PDF document text
    • https://xitorudabetibom.weebly.com/uploads/1/3/1/8/131856365/bowezaxupiwa.pdfIn PDF document text
    • http://gerawat.22web.org/xunudodemo.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/7922269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444856/normal_601a32b2ac651.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/ihW3Ugj/video_face_editing_for_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413967/normal_5ff5352696735.pdfIn PDF document text
    • https://laxafukiwa.weebly.com/uploads/1/3/0/7/130738625/6015114.pdfIn PDF document text
    • https://cdn.sqhk.co/vamapoludi/h3Rggzr/download_aplikasi_lep_s_world_3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369324/normal_5fc9c0d6a6775.pdfIn PDF document text
    • https://cdn.sqhk.co/raserijene/mhisGAx/vonikebezuxafarerukagara.pdfIn PDF document text
    • https://bogekivusuwi.weebly.com/uploads/1/3/4/6/134604255/922138.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/ifGngc8/kefojijapikorobekimotit.pdfIn PDF document text
    • https://cdn.sqhk.co/sugojipo/NQjhjjg/10508841197.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_b65faa4971284630b2dafe179df896a2.pdf?index=trueIn PDF document text
    • http://febagilelefejen.epizy.com/aparichitudu_telugu_full_movie_songs.pdfIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_41ac2e00f8ba4300a84a1fe922a66815.pdf?index=trueIn PDF document text
    • http://bozusofofutuv.rf.gd/dikebokukipirubegim.pdfIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_909e41c3526c4b0e89b4bd2b87888ccf.pdf?index=trueIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_863c1a86f220415a9cba1a6cfe04b8e7.pdf?index=trueIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_d4eb8349a61448769a411ea413a66bc1.pdf?index=trueIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_2fb844b304a24de49d7697c6d92a4ea5.pdf?index=trueIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_f0d6a110fa1a4ac8a9e2d0e074534231.pdf?index=trueIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_bd91b31ea63544c492681c563d49a65e.pdf?index=trueIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_63c2aacc71864415ab3df571c1e475e4.pdf?index=trueIn PDF document text
    • http://girafarurogu.rf.gd/card_college_by_roberto_giobbi.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_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 5668 bytes
SHA-256: 9feee4d983bcdad62cf24964c79a33ae1a4ae345fc410bb91ed58dce0798e2a9
font_01_sfnt_off0000fc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0B 11208 bytes
SHA-256: e34e3a67b0d211986179068727a2927ad09d715c32ba78268f9872618717b573