Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4442bb599c3991a…

MALICIOUS

PDF

62.2 KB Created: 2021-02-24 04:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5ba6fb2167b6b9c97ef61daa4d057420 SHA-1: 95eb62ea3d0ca864b9f4bb6b3084dfbb47adab24 SHA-256: d4442bb599c3991a2bcb049c89d00bc505a58b7a74e81a89b5d7de1901a3c8a3
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to PDF generation, but the primary malicious indicators are the external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wix?keyword=volume+of+composite+solids+worksheet+tes PDF link annotation
    • http://art-practice.org/bigipikedaroxavsjo8.pdfIn PDF document text
    • https://tojefatonixi.weebly.com/uploads/1/3/4/3/134379405/fazam.pdfIn PDF document text
    • http://detonicro.website/stranded_deep_free_32_bits8ydm5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387241/normal_5ffcdbb7d11f1.pdfIn PDF document text
    • http://everydays.space/80s_rock_outfits_female24e5t.pdfIn PDF document text
    • http://parralax.net/51966652048gxnbv.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/XghWbhj/jiposuj.pdfIn PDF document text
    • https://jerigarapo.weebly.com/uploads/1/3/5/3/135327201/635a5bfa950d3d.pdfIn PDF document text
    • http://derewopenila.22web.org/mathematics_questions_for_class_8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408858/normal_6008dd315712a.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/iw1KhfJ/75553345114.pdfIn PDF document text
    • http://bloodcraft.online/pornhub_download_secure_siteq6yx2.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/mLj5hbw/31321643097.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473926/normal_5ff4b2c20d7e0.pdfIn PDF document text
    • https://rigitugatelimo.weebly.com/uploads/1/3/4/1/134131632/56a21b158.pdfIn PDF document text
    • https://piwirajaluz.weebly.com/uploads/1/3/5/3/135312697/9857500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463266/normal_600e5e8596487.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/hibibH4/galaxy_invaders_alien_shooter_online.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_off0000b921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB921 5304 bytes
SHA-256: f9fd3d279210cfa695d278f0ad5cb0ae2f3ec5b05a75de6c3deb7cc9a677e09c
font_01_sfnt_off0000cb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB22 9480 bytes
SHA-256: 1a31f5eca8b67b4d58163b9a6ea0515fab372a0860db129961bb9aabdad93476

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