Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d59e692b167a044…

MALICIOUS

PDF

86.4 KB Created: 2021-03-22 01:36:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ecf358e283683186fca9602372538e1d SHA-1: df9f6b23af07d946006bea35a918d670ee39e015 SHA-256: 5d59e692b167a0448b65f2befae8aa0d90d1298aa514eefefd7245da816bb872
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to obscure the true malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content, specifically identified as a phishing trojan. The presence of external URIs and the 'link farm' heuristic suggest the primary goal is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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/award?keyword=simple+promissory+note+sample+letter+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490244/normal_5fe4f9799f3b1.pdfIn PDF document text
    • http://keepsufi.space/do_nike_employees_get_discount_on_apple_watchsuhmt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450045/normal_600006ec2f78c.pdfIn PDF document text
    • http://liberum.sportsontheweb.net/16120986724.pdfIn PDF document text
    • http://batmbatm.ru/6172590231990fn.pdfIn PDF document text
    • http://limaxinsto.xyz/how_to_create_lookup_table_in_revit_familyyyiqg.pdfIn PDF document text
    • https://ralunudedosamot.weebly.com/uploads/1/3/4/8/134856058/dalitofexazurukog.pdfIn PDF document text
    • http://datab.vip/digital_rebel_xt_battery1ygvn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412394/normal_600a7f9fe4e5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424007/normal_6001423693b06.pdfIn PDF document text
    • http://trylait.pro/63716845459czn06.pdfIn PDF document text
    • https://ziruxirunilexa.weebly.com/uploads/1/3/0/7/130775543/magiso.pdfIn PDF document text
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/4837756.pdfIn PDF document text
    • http://tomandbxof.site/microsoft_excel_cheat_sheet3nvug.pdfIn PDF document text
    • http://avit0.cc/womuvubaledagopidovefibitt4j.pdfIn PDF document text
    • http://uscreditreport.info/the_family_crucible_napierxah4p.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/7779871526.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wafibajew.epizy.com/10203285135.pdfIn PDF document text
    • http://zowujobosega.rf.gd/69716555551.pdfIn PDF document text
    • http://nepezuse.rf.gd/80114988615.pdfIn PDF document text
    • http://zakagoxufi.epizy.com/18348495276.pdfIn PDF document text
    • http://balesalefune.epizy.com/adjectival_phrase_worksheets_for_grade_5.pdfIn PDF document text
    • http://manosotidokef.myartsonline.com/tulabirazaweb.pdfIn PDF document text
    • http://zijiwaras.onlinewebshop.net/27675582593.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_off000110d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D6 5392 bytes
SHA-256: 9e36c098508121c17e764717562e7c4d7f9bcdf85f313ef0516dd851dd8299e3
font_01_sfnt_off00012318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12318 11444 bytes
SHA-256: 0bc0f1aa784efec8e470fca1e99d1fc201a3b2dc04060f3e71f797a2ab7128b5

Open this report in the interactive analyzer, or submit your own file for analysis.