Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37691372e054ec8…

MALICIOUS

PDF

69.2 KB Created: 2021-03-02 12:48:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 9b1587bcf461412c291c9b8f680e9bbf SHA-1: 7fbb8dd33257e4005f982170ff8afda914f9aed0 SHA-256: b37691372e054ec8d3115515e2b35c3ee410e2a58debb017159eb1052a91c058
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'selection and speciation answer key' and mentions 'wkhtmltopdf', indicating a lure to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=selection+and+speciation+answer+key PDF link annotation
    • http://derilezin.sportsontheweb.net/moondance_nightwish_piano_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwasokeg/gjhgdic/45671146774.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/phfZP54/82129489292.pdfIn PDF document text
    • https://cdn.sqhk.co/xawesani/cw5Ff2G/93558419257.pdfIn PDF document text
    • http://mebesovinu.22web.org/fojibebowidodasivapaf.pdfIn PDF document text
    • http://fit-italy.space/3281095suhb5.pdfIn PDF document text
    • http://bimiwefumukiv.22web.org/p99_bard_kiting_guide.pdfIn PDF document text
    • http://ig-copyrightviolation.com/world_war_z_game_trophy_guidexu6wq.pdfIn PDF document text
    • http://domobifotuza.sportsontheweb.net/setina_partition_installation_instructions.pdfIn PDF document text
    • http://vbnmcxz.xyz/us_history_regents_new_framework2axth.pdfIn PDF document text
    • https://cdn.sqhk.co/potexunajo/egihjjb/love_arthur_lee_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/nukunudakiju/XWgdWK6/buxupob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rixigor.onlinewebshop.net/96201427472.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/vonukatazozorexoz.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/video_er_extension_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/az_registrar_of_contractors_complaint_form.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/70881459371.pdfIn PDF document text
    • http://kepojuwewi.rf.gd/25115282509.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/21723543472.pdfIn PDF document text
    • http://zasugizej.epizy.com/59499535958.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/godufigimula.pdfIn PDF document text
    • http://zejenideve.rf.gd/information_classification_examples.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_off0000d2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C3 5428 bytes
SHA-256: c2fb2879871c8f58e874ba526fae17411b19ef52124bd1969b5c1742f27b37d6
font_01_sfnt_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 9892 bytes
SHA-256: 4a2d5c4bf958e70a41a5ac4b6035d6a6575cfd49412a96ebd602e9e750ce2ddf

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