Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10fd18d187edb1e…

MALICIOUS

PDF

74.7 KB Created: 2021-03-04 03:01:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 43511b98e746ab4e6684334264e73b19 SHA-1: 47c9f836f5bc9169b01183d71966412aec7222a1 SHA-256: d10fd18d187edb1ecb1b96c0fbf285aebf60e79587501df4ad67656a15f95ecc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to facilitate initial access via spearphishing, leading users to potentially malicious websites.

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://gimoguvi.ru/123?utm_term=the+idiot+movie+2014 PDF link annotation
    • http://poradoit1.site/fish_and_seafood_should_be_stored_bekenpe.pdfIn PDF document text
    • http://instapriz24.online/77992292263a8pkm.pdfIn PDF document text
    • http://twirlini.com/optiplex_755_audio_driver_windows_7_free_downloadppdf0.pdfIn PDF document text
    • http://flash-sar.online/dudinagokajajv1bs.pdfIn PDF document text
    • http://899themes-demo.ru/95456874125m5bzs.pdfIn PDF document text
    • http://storeyou.store/borilotaxokabedovovuvixetmso12.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/53652976040.pdfIn PDF document text
    • https://cdn.sqhk.co/reposivekow/jdjj9Wm/nirvana_game_of_life_no_download.pdfIn PDF document text
    • https://cdn.sqhk.co/disidudi/tcichj0/carrom_play_and_compete_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408713/normal_603eaae85d4d0.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/is_deed_of_covenant_necessarywb1vv.pdfIn PDF document text
    • http://djami.ru/dixiferorejewumetuq4mal.pdfIn PDF document text
    • http://soldonlittleton.com/movawadjcq8o.pdfIn PDF document text
    • http://mikrotikwizard.com/typology_in_the_bible6eeze.pdfIn PDF document text
    • http://smeshnoykir.space/harry_potter_und_der_stein_der_weisen_hrbuch_download_free3d3qw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 4972 bytes
SHA-256: a09a4d66a589265c85483837b5a10c9eb32762b9fd1a791dd61a30db4ec21942
font_01_sfnt_off0000f719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 11968 bytes
SHA-256: b751f16c6153da85576c090cd2bf718a9c53beb6fa6cf031a0020c05e76271f6

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