Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9bbf9cac61e9cc…

MALICIOUS

PDF

162.8 KB Created: 2021-06-12 21:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3ddf8b7a2fda2023e506df427875d5d7 SHA-1: 8a32ec6fee748b0a909f2ab0d78b33b5ebe7d967 SHA-256: 4f9bbf9cac61e9cc6030d5dd9208a2f52414452468bac088611026bdbee72621
136 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it's a phishing lure, specifically using an image to redirect users to an external URL. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL and the presence of other PDF files on similar domains indicate a likely phishing campaign aiming to distribute malware or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://huntic.ru/pbw?utm_term=crisis+on+infinite+earths+hour+three PDF link annotation
    • https://famepajovajegow.weebly.com/uploads/1/3/1/4/131438188/1749302.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4427273/normal_60b3478c74438.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465267/normal_6004140d83555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475861/normal_6059c98ebb8fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424364/normal_6027938d8cc0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476126/normal_5fcc739ce7e88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455178/normal_6054d8fcc7573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387410/normal_6011518aa8919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466172/normal_605c94d00d8ca.pdfIn PDF document text
    • https://nisikigibifug.weebly.com/uploads/1/3/0/8/130813528/8539140.pdfIn PDF document text
    • https://rijigajigife.weebly.com/uploads/1/3/1/8/131856487/996e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_601a38f147ef1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_6065eab0bf033.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/04e0f762-11ad-4006-b478-17df41854a42/xegaregewogozarekab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e84b1a-2174-4f0d-b174-ebe28d4e4bde/what_is_the_importance_and_purpose_of_writing_a_business_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b321d6f-ff59-4127-9f6c-88e6c2750677/66923292842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3deeb37-46eb-4cd4-b15b-7cf5aff29f8c/23105886920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74488f38-d34c-4e85-9481-660e9fc733e6/what_is_lean_six_sigma_certified.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92abf747-0806-47e5-8f46-c45c1797041d/nubufosaxas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdf8e8eb-3d58-4006-9658-32587aa908ba/linear_algebra_and_its_applications_2nd_edition_solution_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb415f3-6057-4558-9c49-2fee95f8524c/lukigaxusi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22DC3 4728 bytes
SHA-256: 06e015ad8194635116c3938c7da380b78ce31521eba38cd6cff40a46a6abf134
font_01_sfnt_off00023dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23DC8 12616 bytes
SHA-256: 52afeee5a74661cead590e5597215fe5333af3837f081887cc4b2504ecac4dfb
font_02_sfnt_off000267ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x267EA 16344 bytes
SHA-256: ed45a24507f18daeaf6b6e9cac20235e9e43bed88bc2d44b7621eff085e31190