Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0e95be620892d2…

MALICIOUS

PDF

74.3 KB Created: 2021-03-25 08:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 37d388ab0cd6f2c120a5a6269a79786a SHA-1: 99f80210e4d34162782262a38289439aaeadd39c SHA-256: 9f0e95be620892d2c3359c555da6aa7cc7309d6b641bd1d4b0bc2b4424ddfb4a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bologen.ru/wix?keyword=sex+linked+dihybrid+cross+worksheet PDF link annotation
    • https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/7e03554f40b1f.pdfIn PDF document text
    • https://mumifigade.weebly.com/uploads/1/3/4/3/134314269/8641779.pdfIn PDF document text
    • https://sezijaxafiv.weebly.com/uploads/1/3/1/6/131637080/2359b0.pdfIn PDF document text
    • http://kaxavetaxudu.mywebcommunity.org/xoxorafazekaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/fekojedutugetos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2545ce70-e2fc-4d3d-95d4-0f6da1c440f7/34285478175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17a31ef2-6d3d-4f6f-af3a-1b85267f4c8a/14329433822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7192a1c2-6cbb-47d3-9a5d-9e4fc9a8165a/materials_for_civil_and_construction_engineers_4th_edition_chegg.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/7524186959.pdfIn PDF document text
    • http://batapijas.myartsonline.com/zuxazupejabikuzosowaboxiv.pdfIn PDF document text
    • http://bevonox.epizy.com/hmmwv_quizlet_answers.pdfIn PDF document text
    • http://nanesipub.rf.gd/android_cardview_background_xml.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1085026-5f47-413f-a853-3824407e9114/economic_loss_doctrine_affirmative_defense.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39cb44dd-7688-4ec7-a3f4-74915174f081/65502367420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90fb16d5-12db-43f5-ae84-b2f510263c5c/88900815484.pdfIn PDF document text
    • http://kotutuvotijol.rf.gd/atwood_furnace_part_31501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf8e2ce-5ff9-4e4e-b0c5-33b26b3c0c22/introduction_to_management_science_13th_edition_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/awadhesh_premi_gana_video_hd_bhojpuri.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_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 5384 bytes
SHA-256: 02e637a6b7d94b4b53b2740683e4c2575435c3e1c78b0cc5e27db6254bf040e5
font_01_sfnt_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 10916 bytes
SHA-256: cb9b98e831df6116d5acb8563482b1fa8a93f1f49886bc347a0ac13bf521c514

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