Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cebe5b85926d6a…

MALICIOUS

PDF

84.6 KB Created: 2021-06-08 00:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cf615a52ef243b0d533ccccbae808db9 SHA-1: eff1dac62cd6c2ef87f13ca9181a74626dddb39c SHA-256: 36cebe5b85926d6a52cae32a67d60c488ed30cb15a240ede15ffdbdb1660d9fe
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 0.9998

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://crewmak.ru/pbw?utm_term=restriction+enzyme+worksheet+answers+key+university+of+canterbury PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405202/normal_6006f0f01b789.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4408485/normal_60b02211b1c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_600cb71c95668.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496153/normal_60632dfab3a2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460045/normal_602d65bde0acd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ririgifavem.pbworks.com/f/gezabodoweda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb797ec-c287-4c64-82e9-d18f19f78abe/how_to_write_short_concise_sentences.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/w/file/fetch/144821958/zifafividunasibesujaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6533e08f-1f1b-4485-a593-02a459ae935c/votozebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d23179-b79c-4134-975a-20200482ccf8/mufor.pdfIn PDF document text
    • http://dawanitapix.pbworks.com/f/surface_area_and_volume_of_composite_shapes_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e6c584-5225-43cc-bb84-5ccb590cb8dc/what_are_the_types_of_organizational_structure_in_public_administration.pdfIn PDF document text
    • http://mutoteja.pbworks.com/w/file/fetch/144624324/kifuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ea9bbb-823c-47cc-9891-81ce1beec06a/pokken_tournament_iso_dream_kaif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2ce74c0-b0f5-40cd-bf29-8298748f8e6f/ninja_blender_food_processor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f326223d-f88a-4589-9a2a-75d5220b3376/local_studies_about_academic_performance_in_the_philippines.pdfIn PDF document text
    • http://kivupored.pbworks.com/f/25000693481.pdfIn PDF document text
    • http://sajutom.pbworks.com/w/file/fetch/144705687/mhm_mthode_heuristique_franais.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 5488 bytes
SHA-256: 4d6751d1c0d7e3af319c21b8b0966f01dc97fe4b8e439299b309f04a2f7e4629
font_01_sfnt_off00011033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 11280 bytes
SHA-256: c43301c8b582a6091b4ddc493c607191c4c8380790973f639c539a02162a5c0e
font_02_sfnt_off0001361c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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