Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffd79cce7ef0d05…

MALICIOUS

PDF

79.1 KB Created: 2021-04-06 12:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 501beecf097eb832da676d681b662380 SHA-1: e56caf4f5e2b662ea2379cef65d379faee8891f9 SHA-256: fffd79cce7ef0d05243b6515370248bc2a89626cf0fcfc5b45da5e8fc11dfa70
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation, likely to host phishing or malware. The presence of external URIs and the overall detection as a phishing trojan strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/123?utm_term=college+board+psat+2015+practice+test+answers PDF link annotation
    • https://nozirokopen.weebly.com/uploads/1/3/4/6/134613575/29113aacd.pdfIn PDF document text
    • http://alisaborodaenko.design/50209701040pvly6.pdfIn PDF document text
    • http://vir-tus.com/congress_of_vienna_worksheet_answerszq12w.pdfIn PDF document text
    • https://sovomebidug.weebly.com/uploads/1/3/1/3/131379042/26144ff61.pdfIn PDF document text
    • https://kikokowenut.weebly.com/uploads/1/3/4/7/134713101/694417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378607/normal_6068c9d07c1da.pdfIn PDF document text
    • http://vudifabofugejij.medianewsonline.com/46741325850.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404739/normal_6013e8b9dcdcc.pdfIn PDF document text
    • https://pexasuwen.weebly.com/uploads/1/3/4/5/134593650/sinewug_parenidadadega_duriwoxesagi_sejogotogemom.pdfIn PDF document text
    • http://virivuluk.getenjoyment.net/19390870189.pdfIn PDF document text
    • http://bluebadgeapproval.com/cds_syllabus_20201pkao.pdfIn PDF document text
    • https://tamunalu.weebly.com/uploads/1/3/3/9/133999965/7777f6ae7f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490746/normal_603158f111e9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485001/normal_5fdff761d8eb2.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/pezerewojelowexutesukap.pdfIn PDF document text
    • https://xolipesu.weebly.com/uploads/1/3/4/6/134672505/suvinasukojo.pdfIn PDF document text
    • http://busforpay.online/28623870247f7dgg.pdfIn PDF document text
    • http://amsidgi.xyz/27881609129kqvgm.pdfIn PDF document text
    • https://zatazonikafude.weebly.com/uploads/1/3/4/3/134340422/7541162.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b170403-e322-4de3-8803-3cc19a051a61/1556505818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/356f915d-d681-421b-9801-b540f30e3224/sonic_large_tater_tots_with_cheese_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d8659de-76b2-46bc-8689-7c3374ae1366/fipokutet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98c3e62b-222d-48e4-ac8c-945a12d9830c/75714025139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93be2bc6-bc05-429b-bd3c-2be8fb5bb138/laxorenimo.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_off0000f672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF672 5828 bytes
SHA-256: 8649c3fafc3e90d63785c12d8d2210f9abb6af2b397bee7a4a9a7d1a644bbfb2
font_01_sfnt_off00010a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A69 10624 bytes
SHA-256: f30c7932df888c8748ee19fca1bed22ee9a5e92bd5891c512f9db7c0bf16d8da

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