Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e392b446c4ce50…

MALICIOUS

PDF

76.1 KB Created: 2021-04-19 00:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 01028ed2d9a9affc9be5e768c29f147a SHA-1: 2528e17a2af5f0b1fc40f2e797bdb65719d35924 SHA-256: f7e392b446c4ce5047195f409306143aa59c4969290bd134bd7984a89f997724
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and exhibiting link farm characteristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=fender+champion+40+specs PDF link annotation
    • http://grusha.space/25924526096b13c1.pdfIn PDF document text
    • http://xovuwowim.mypressonline.com/60073500133.pdfIn PDF document text
    • http://stankoff.org/258862137560pyz7.pdfIn PDF document text
    • http://megantv.site/quality_management_strategy_examplesquds2.pdfIn PDF document text
    • http://okclub.org/zekavufunarewmsej.pdfIn PDF document text
    • http://copytoshka.ru/serelalokmq2qd.pdfIn PDF document text
    • http://subbellassecret.com/whale_done_free_download36k42.pdfIn PDF document text
    • https://vedasozeseso.weebly.com/uploads/1/3/4/3/134388395/wifiwapofaz_gebija.pdfIn PDF document text
    • http://jijomaj.getenjoyment.net/how_to_label_multiple_plots_in_mathematica.pdfIn PDF document text
    • http://lopixerirerenex.mywebcommunity.org/azolla_uses.pdfIn PDF document text
    • http://zelafagilu.iblogger.org/zurefo.pdfIn PDF document text
    • http://bimovixexena.scienceontheweb.net/piano_songs_easy.pdfIn PDF document text
    • https://xesufomoma.weebly.com/uploads/1/3/1/0/131070197/buxuwogitiz-ninofor.pdfIn PDF document text
    • http://tuwimig.scienceontheweb.net/viramewize.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wanudoxemix.epizy.com/tesis_sobre_el_cambio_climatico.pdfIn PDF document text
    • http://roxegubipav.epizy.com/88180348011.pdfIn PDF document text
    • http://lawupoxag.epizy.com/82694407260.pdfIn PDF document text
    • http://ralemagafi.epizy.com/job_interview_questions_and_answers_about_yourself.pdfIn PDF document text
    • http://vefugiw.epizy.com/sopijabaxoro.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_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 5468 bytes
SHA-256: 68aa6bad03b8581bac12cab3916821920d43de7b59303ae62bee2eaaebed8054
font_01_sfnt_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 12156 bytes
SHA-256: 1023f8a87ea5e75bed07a8866118f0068c7804077cf3f840a165b58f79dc4db5

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