Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bef7e2a4fe5f2e2…

MALICIOUS

PDF

73.1 KB Created: 2021-03-25 07:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 042b02b37a85c3f12c3cbcc731c2804f SHA-1: 9704090bfaac26bf191fe46645711f42dd35ce6b SHA-256: 3bef7e2a4fe5f2e2d3a8c4fdee86ce4cc0d68056c7060c65275166f9e70a73b5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9991

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=insulators+and+conductors+worksheets+for+5th+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472495/normal_602984cc949dd.pdfIn PDF document text
    • http://xodikiz.iblogger.org/marguerite_duras_l_amant.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411926/normal_602815e64a6c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528959/normal_605a256f66832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470223/normal_6038406a06bd2.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
    • https://s3.amazonaws.com/bulalowisu/95923055218.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/the_hound_of_the_baskervilles_story_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/30065913665.pdfIn PDF document text
    • http://vedapasu.epizy.com/anticonceptivos_inyectables.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_38602a00ec5e4c1099f6741d52be5f6d.pdf?index=trueIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_7b34e4d1df2f40288ffe5669b01b6f8f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kegovev/what_are_the_examples_of_parts_of_speech.pdfIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_a04b820fb7974f20ab1309e6865d474c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xakusineba/is_hunger_games_ok_for_12_year_old.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e59c4f7e-5cc8-4ef8-b86f-a836109f6293/walls_of_babylon_height.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07b1ebbe-af5d-4870-b193-4556fae523d2/koguvurinabajumas.pdfIn PDF document text
    • https://a1caaca2-2281-43ca-b2b5-e8dcf6f2a4ec.filesusr.com/ugd/c6e36d_53c2b11bdabd45a2a7cea36151a62769.pdf?index=trueIn PDF document text
    • http://rivobuzuxi.epizy.com/asthma_diagnosis_and_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/98392868662.pdfIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_03db9fef9ffe4aebaa64858ae57e019d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xotomisen/arundhati_mp4_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/shinsetsu_samurai_spirits_bushido_retsuden_ps1.pdfIn PDF document text
    • http://mevonaku.rf.gd/phase_2_phonics_worksheets_tes.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_off0000d2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AE 5336 bytes
SHA-256: e6025512b876325acd7354738c46227a3da613fc287b294eb316f2b40109419c
font_01_sfnt_off0000e4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E0 10344 bytes
SHA-256: e90e09d07f514ea6ed19b5e2a5e7674d99da97e61238362724f9cd61df932e37
font_02_sfnt_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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