Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab57f66baa959519…

MALICIOUS

PDF

76.8 KB Created: 2021-03-22 05:38:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 91663e367df63acecaf3e5b2539c9fda SHA-1: 86d469b0740b6921eb78f33cb9405cde835fd1bb SHA-256: ab57f66baa959519b974cb47d2efa5ceaa3a62a35cff9bcf7a5e5dfe8f9365c2
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a primary focus on directing users to a link farm hosted on disposable domains, disguised as a search result for "the alchemist questions and answers pdf". The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious 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://seumenha.ru/wix?keyword=the+alchemist+questions+and+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417206/normal_600afe10c5c7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_5fd17c774e213.pdfIn PDF document text
    • http://ufenmac.com/why_is_the_red_standby_light_flashing_on_my_samsung_tv188wx.pdfIn PDF document text
    • http://fodokimi.22web.org/wheel_of_time_book_16_release_date.pdfIn PDF document text
    • http://stat-index-co.com/87758475709ca34p.pdfIn PDF document text
    • http://chebsvet.ru/xipojewiwixozavepgh29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_245f8c79cfa04fc3b06c1a9d608886b5.pdf?index=trueIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_7c6f46e87c604fd59ca3d231eafbab06.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a930037d-df41-45b7-875e-d531ae067946/49326740345.pdfIn PDF document text
    • http://zasasopatadinu.epizy.com/midiwozevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d20b3f1-ca55-4787-a24e-3c498bfa320b/why_does_my_bluetooth_headset_keep_disconnecting.pdfIn PDF document text
    • http://vaxokepa.rf.gd/emailer_design_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57d95e53-3f57-4689-9044-318b2319b75d/71940268305.pdfIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_ec66c46fe1e74186904af944fd1d845d.pdf?index=trueIn PDF document text
    • http://topuwagib.epizy.com/free_printable_bible_bookmarks_templates.pdfIn PDF document text
    • https://74f55dc1-c9a5-4be3-8cb6-5a41d2e6c5ca.filesusr.com/ugd/bacb18_a5f6458daf05434eab6b0f34d590c3d0.pdf?index=trueIn PDF document text
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_a1f33b5f04614c5cbf8b0f63417d49ac.pdf?index=trueIn 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_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 5564 bytes
SHA-256: 13b00a2b4d759884a1a89caa9d9c7d3879c86e07728ee506a4b199fd1963d56d
font_01_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 10904 bytes
SHA-256: f21b56c8ad77f414c2559414dd1936772421f13007419f2e4dc1ab886b2183fb

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