Malicious PDF — malware analysis report

Static analysis result for SHA-256 681fff075f2621e6…

MALICIOUS

PDF

65.8 KB Created: 2021-03-09 23:04:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 564679019e60bef53ff74f09fa10f6f0 SHA-1: a87f94cafadf239a4fbbd35ecd8600b7efe4f47a SHA-256: 681fff075f2621e6680a8ab50ddcba979d7425df9700b85e33d88eda99229c5b
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to "waves unit test answers", likely a lure to entice users to click on the malicious links.

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://lozipotod.ru/wix?keyword=waves+unit+test+answers PDF link annotation
    • https://cdn.sqhk.co/ziloteduxemo/hgAjeBi/42881630887.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/aihNhdU/cars_crossy_road.pdfIn PDF document text
    • https://zixojubagever.weebly.com/uploads/1/3/4/6/134613499/3607554.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/hhdrghg/android_radio_button_checked_programmatically.pdfIn PDF document text
    • https://cdn.sqhk.co/dexasubu/bCHkzgc/north_american_football_in_spanish.pdfIn PDF document text
    • http://xsale.trade/pufijadexagkmc.pdfIn PDF document text
    • http://sarkife.site/is_sulphur_trioxide_ionic_or_covalentkj4zd.pdfIn PDF document text
    • https://tujupanex.weebly.com/uploads/1/3/5/3/135333196/9d4cc4a1512.pdfIn PDF document text
    • https://bemofoserobonuw.weebly.com/uploads/1/3/0/7/130739893/sivak_devezegoroxu_falovekukokexo_favuguzuzinuke.pdfIn PDF document text
    • http://komarovskii.xyz/can_you_make_sandwiches_on_a_george_foreman_grill620nl.pdfIn PDF document text
    • https://zobimodajozo.weebly.com/uploads/1/3/4/3/134340865/8761996.pdfIn PDF document text
    • https://fezekisovo.weebly.com/uploads/1/3/4/6/134661064/girofupexomadit.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/how_to_do_the_cfop.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/BKifii1/60178528628.pdfIn PDF document text
    • https://riwumoba.weebly.com/uploads/1/3/5/9/135965326/dotedo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/hoover_windtunnel_whole_house_rewind_belt.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_off0000c719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC719 4812 bytes
SHA-256: 15c8d2cd84a0f83e8978a22a5bbf6baa9312ef72e86509d979c04c0491e6fcd8
font_01_sfnt_off0000d798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD798 9796 bytes
SHA-256: c0d183bd75836f573a15eb2b945a2af4cf954f9089fc9db7584aef6764a4287f

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