Malicious PDF — malware analysis report

Static analysis result for SHA-256 96831929ee565f40…

MALICIOUS

PDF

78.2 KB Created: 2021-05-04 09:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 72fcb6470265b9c1d26d3fc446cb1868 SHA-1: 57872d4fae423c3a9d39630399e0ee774baec550 SHA-256: 96831929ee565f40d117f7ed51244fd03e56dc2ca49918f6d80c3b761ee5df86
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 0.9961

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://fokemale.ru/strik?utm_term=how+to+calculate+the+total+interior+angles+of+a+polygon PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387715/normal_5fe338633f440.pdfIn PDF document text
    • https://sadavofabuloxus.weebly.com/uploads/1/3/5/3/135316226/dapetipejaxirebitami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500893/normal_601ce5257ff82.pdfIn PDF document text
    • https://xonatiwomunonow.weebly.com/uploads/1/3/1/8/131856992/totulunexanemid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413845/normal_605f653611f75.pdfIn PDF document text
    • https://jomigotub.weebly.com/uploads/1/3/4/7/134748998/pojuzabawosasebemapu.pdfIn PDF document text
    • http://jezapaditasas.22web.org/texudolep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388422/normal_5fd69a9b12679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_605a6f9b99508.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391642/normal_5fe0ecf942f5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384320/normal_6032cc7b94d25.pdfIn PDF document text
    • https://nuzukozifazo.weebly.com/uploads/1/3/2/6/132682871/fosefoxo.pdfIn PDF document text
    • https://tamejozapana.weebly.com/uploads/1/3/2/8/132814544/lidekokipemuk_zirodixomenez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450340/normal_5fdfd7ecac0b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479226/normal_5fe07df712bfa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wizidiz.epizy.com/50052835647.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/lolis.pdfIn PDF document text
    • http://foraxevub.rf.gd/charity_donation_tax_form.pdfIn PDF document text
    • http://nivitigu.epizy.com/4628416421.pdfIn PDF document text
    • http://fowafad.epizy.com/16043734146.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/interview_answer_what_is_your_biggest_weakness.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32a4e50e-51bb-4dfc-9810-313022c5b0b6/zejisuwoluxuxenunitokobo.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/manafafuniloto.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/adnan_sami_all_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/32567957513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d961192-019a-4816-89dc-309238b8e681/nalem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66beac45-94a6-4561-ad06-aaed32788fce/convert_to_jpg_in_paint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bcf0c37-93e5-487a-a00b-b54df3b94f7f/walgreens_blood_pressure_monitor_error_e4.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_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 5432 bytes
SHA-256: 677fb4e8f005f2fbebdfb23f480d2f6804fb8e66d470f560522da31f16ecd7f8
font_01_sfnt_off00010190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10190 11684 bytes
SHA-256: 04594de477f1dd0f3a76bef8630499f14ec10f8163beb90231b8e45f6ebf4e38