Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e57310a64d67c99…

MALICIOUS

PDF

75.4 KB Created: 2021-04-30 09:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 576ad5c601f4f1c9082752cbe332ba4b SHA-1: 9b73f4373175683aa62105a28c3149565dbe1158 SHA-256: 3e57310a64d67c99ee1ee062a8b9b7bdbec14543f081374cb1f7d127cc50e2df
126 Risk Score

Malware Insights

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

The PDF 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 delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents 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://druttle.ru/strik?utm_term=how+to+cite+electronic+journal+in+chicago+style PDF link annotation
    • http://dafesoxexigu.medianewsonline.com/88155615580.pdfIn PDF document text
    • http://puditutado.22web.org/68358094383.pdfIn PDF document text
    • http://govuxojikasumot.scienceontheweb.net/sharp_objects_book_age_rating.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/EWgjqgj/best_1080p_movies_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/hcVG829/53754377011.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/Fijgjie/daladibaduwamokufekimokiv.pdfIn PDF document text
    • https://cdn.sqhk.co/foxoxaze/hTtB7MO/adderall_dosage_by_weight_for_adults.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/how_to_reboot_my_fios_cable_box.pdfIn PDF document text
    • https://cdn.sqhk.co/wemerofada/9Rufhbw/57314556778.pdfIn PDF document text
    • http://dimupure.22web.org/42354200116.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/eOz6XWv/mr._bow_arrow_legends_stickman_archery.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/bezegoluzose/guide_culture_loisirs_gatineau.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/bichagadu_telugu_movie_songs_free_320kbps.pdfIn PDF document text
    • http://bavatesivo.myartsonline.com/career_guidance_after_12th_science.pdfIn PDF document text
    • http://rawonuruked.rf.gd/first_things_first_rip_uncle_phil_for_real.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/gepilibimusunuxosek.pdfIn PDF document text
    • http://monudaduxafe.epizy.com/87000071459.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/wasajejaxejunolipixar.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/pexerulubawuzeperotam.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_off0000e689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 5292 bytes
SHA-256: dcd95b632ec727e61caee555cb6c8565c0e3f7ae37eb4cad2a470a51e22e62ea
font_01_sfnt_off0000f899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 11640 bytes
SHA-256: a853184e28c5b50d6d195119d1a8edd42d2690b79e4cd0b65064e1f3e430f1d4

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