Malicious PDF — malware analysis report

Static analysis result for SHA-256 18777a8b8a916e07…

MALICIOUS

PDF

123.8 KB Created: 2021-05-01 09:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 76da1544e9e07da432f21aee350e6c4e SHA-1: a9791019c91bbf7160ec8edf5c888dcc6157bba4 SHA-256: 18777a8b8a916e07fa9aaf2420818da9d9fe0360ed25a6b783023676614562a7
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful sites.

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://kuzutuzo.ru/strik?utm_term=pillars+of+eternity+2+deadfire+strategy+guide PDF link annotation
    • http://dusosax.66ghz.com/clat_2019_final_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/gokutafa/r5j6gfa/modele_attestation_employeur.pdfIn PDF document text
    • http://manovina.mypressonline.com/pakiwukokubux.pdfIn PDF document text
    • https://cdn.sqhk.co/kuburarimoku/EwWDjb0/metal_slug_6_arcade_spot.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/ciiGqMs/fujakij.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/access_database_tutorial_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/jiloduvunilu/jiJfOE4/89427286393.pdfIn PDF document text
    • https://cdn.sqhk.co/zevinikiwi/iOhdha4/pac-_man_256_ps4.pdfIn PDF document text
    • http://kosamaritaj.getenjoyment.net/weight_loss_diet_menu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuxime/charles_aznavour_for_me_formidable_wikipedia.pdfIn PDF document text
    • http://doritiwenoxa.onlinewebshop.net/dubowokugefufizoba.pdfIn PDF document text
    • http://sadedegigagivaw.rf.gd/46923851305.pdfIn PDF document text
    • http://duxuramubot.epizy.com/18437246501.pdfIn PDF document text
    • http://favekagopu.epizy.com/momapujosa.pdfIn PDF document text
    • http://ninivekav.rf.gd/37837082345.pdfIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/27642804850.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/adobe_premiere_pro_2020_download_windows_7.pdfIn PDF document text
    • http://pekinomigaw.epizy.com/materi_kebutuhan_dasar_manusia.pdfIn PDF document text
    • http://karadefega.epizy.com/drums_of_autumn.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/avg_pro_apk_6._16._4.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_off0001a990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A990 5308 bytes
SHA-256: 7da77d9569806d24bb36800c7886170bda6e544fab3aba2ce007f660bbf8ee23
font_01_sfnt_off0001bbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBBB 11040 bytes
SHA-256: 32b9966db0a38e68c0ae9fdfea86fc19231bede789aec551c5314e7ab8d27847

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