Malicious PDF — malware analysis report

Static analysis result for SHA-256 998237401a35be50…

MALICIOUS

PDF

77.8 KB Created: 2021-02-28 19:39:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ee66be52c4e8a285f15f5195c57053e7 SHA-1: ecf1cc4fe14b070f464265e4d459dbaf7d33ae24 SHA-256: 998237401a35be50bb9f70316a9417c014f3edd6d48542ba5b7e945873de5bfe
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The PDF structure and embedded content suggest it's designed to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/123?utm_term=what+were+the+privileges+enjoyed+by+the+first+and+second+estate PDF link annotation
    • http://goproonly.com/12481321029ynvnl.pdfIn PDF document text
    • https://bazeliwelari.weebly.com/uploads/1/3/1/8/131857734/vitabenosumi-zirejelixazixik-wakifaji.pdfIn PDF document text
    • https://cdn.sqhk.co/virixerusupa/CjajfXk/sabitaz.pdfIn PDF document text
    • http://leledup.mypressonline.com/tajep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_6024455c8a8ae.pdfIn PDF document text
    • http://dfds.in/hunger_games_book_1_ending_summaryyas6g.pdfIn PDF document text
    • http://timogefubor.22web.org/83258816319.pdfIn PDF document text
    • https://cdn.sqhk.co/xoripudesew/hSAcjct/costumes_for_dogs_and_cats.pdfIn PDF document text
    • http://tryici.xyz/58748745814i1jve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_6019ff3d647d5.pdfIn PDF document text
    • http://wawimetuboze.iblogger.org/liwuzojakopor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421050/normal_60248cab0d2d2.pdfIn PDF document text
    • https://jubibololir.weebly.com/uploads/1/3/2/8/132814038/tasilelemarixekotifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393044/normal_600f8ede38567.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/jojidoto.pdfIn PDF document text
    • http://fitit.space/fairy_tale_comprehension_worksheetsvi6tq.pdfIn PDF document text
    • https://tasitovutad.weebly.com/uploads/1/3/0/9/130969559/ea40b229aa6.pdfIn PDF document text
    • http://idslim-italia.site/7753652079425asu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://daxeletibumu.rf.gd/caller_tune_ringtone_pagalworld.pdfIn PDF document text
    • http://poruworetizilu.epizy.com/cellule_vegetale_cours.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_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 5900 bytes
SHA-256: af05ca86d50b9f3b5d1e35f05eee7a2658f52e7a615c1acc836980818a02b8d7
font_01_sfnt_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 10000 bytes
SHA-256: 6afc821a947a12294ea5dc74e1ccd3bd827e93cf8e2d8087039427d818b5ceb2

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