Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b746ef97a8e71fc…

MALICIOUS

PDF

86.0 KB Created: 2021-03-11 06:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c1d97dfc458e5f8a5a9d64d08c4045cf SHA-1: 5bb77e9cf18097346a6bc9d6c2b7638c79192776 SHA-256: 4b746ef97a8e71fc52cc941376aaa83c5b23e8caef56c2c2383aa7e0e8b7d443
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9955

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 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://bologen.ru/strik?utm_term=are+all+xbox+one+wireless+controllers+bluetooth PDF link annotation
    • https://cdn.sqhk.co/wejafivelij/if7mNjd/natural_nails_salon_hockessin_de.pdfIn PDF document text
    • https://vopusufibos.weebly.com/uploads/1/3/4/7/134731751/2efa519.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500430/normal_601d3ac162da1.pdfIn PDF document text
    • http://bowemesuzot.iblogger.org/what_are_the_principles_of_health_economics.pdfIn PDF document text
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/2849918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5fe8da2853538.pdfIn PDF document text
    • https://cdn.sqhk.co/fifusaji/gKchmIQ/joplin_tornado_2011_facts.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/spLieih/paint_the_cube_levels.pdfIn PDF document text
    • https://nuvosukive.weebly.com/uploads/1/3/4/7/134718285/44d75fc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473637/normal_5fccfbb6e42cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465003/normal_60228ab94bb6e.pdfIn PDF document text
    • https://cdn.sqhk.co/xagogudexo/l6hfvji/96479638713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481056/normal_5fd27655cd604.pdfIn PDF document text
    • http://vuvowepo.22web.org/load_crystal_report_in_c_winform.pdfIn PDF document text
    • https://lewuseloti.weebly.com/uploads/1/3/1/4/131437615/a538fc41d6c.pdfIn PDF document text
    • https://cdn.sqhk.co/ranotigu/v6Uhffe/bhojpuri_video_songs_free_website.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://uploads.strikinglycdn.com/files/12ea5e59-111e-41d7-acb5-f01bd3b26263/how_to_multiply_and_divide_time_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/how_old_is_the_joker_in_the_dark_knight_returns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6acc525d-6a14-4b4f-8ad2-1fc579c6befe/best_multiple_streams_of_income.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccfeff4c-ba57-4ac5-ae40-7d3c0bc5248d/sulezekuxotujedekine.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/square_root_of_43_in_radical_form.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/jitixulilapupokasomida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fca839c-5689-494c-9f65-b3b06a540551/art_history_volume_2_6th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/infinix_android_one_review.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/acute_pancreatitis_guidelines_philippines.pdfIn PDF document text
    • http://funolowudako.epizy.com/acca_examiner_report_september_2019.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_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 5060 bytes
SHA-256: a44e109e133cfd93a784c479e921362940d2dbc8d82784ecaecd7a1154a39760
font_01_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 11096 bytes
SHA-256: 8c94e795dcaf09d2942a72697e1c2b316099413be1e77dc85d59661d851d48ba
font_02_sfnt_off000139dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DC 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c