Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f23f87a92625fa6…

MALICIOUS

PDF

70.9 KB Created: 2021-04-09 18:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 13a62a46d5a240727f542bdba852214b SHA-1: db13e1bbcaad6f20e01284528c833f61c161bf7c SHA-256: 8f23f87a92625fa663c2bab4ad5432feafe1af7b7620eae2cdcd6b3c6b5884b1
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 0.9996

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://jumiwimov.ru/strik?utm_term=modal+verbs+multiple+choice+exercises+worksheet PDF link annotation
    • https://cdn.sqhk.co/jigavozef/K19ib8E/lenovo_ideapad_3_14_review.pdfIn PDF document text
    • https://cdn.sqhk.co/perikowep/b7hhKsO/launcher_galaxy_s20_style_premium_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/gXJhgaI/hot_romantic_video_status_for_whatsapp.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/SIsduje/rotator_cuff_tendonitis_surgery_recovery.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403937/normal_601b4771c2a71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389816/normal_5ff54d0ebdaeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464996/normal_60178c35f0c51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422645/normal_6032cc17ddb20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374860/normal_5fc7f0512b728.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450043/normal_5ff56a27de5d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453902/normal_5fd82af43e70b.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://uploads.strikinglycdn.com/files/f5194c07-a2c9-46ef-a44f-afdd3cb48aaa/dabifolukura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c20b23d-e70c-4d52-988a-6f0a45b71a96/cloud_atlas_famous_quotes.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_d8753b3896b440f5b7b2dafe0df6ce50.pdf?index=trueIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_0b76c7ac0c0746e79a71adb1f917c64f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0f55b54-69ff-4399-8a0e-f8684d6859eb/vilanofivosawip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338ae59e-0483-4def-87b3-7abc4aa56062/the_story_and_its_writer_10th_edition_barnes_and_noble.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_1e2a6be433d44ca5bf7f7583eaa6390b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7bfa0ec-5276-422b-9ede-ca2932d91776/29602238546.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd6234a-37e2-4d1f-8fe9-2c580627d1ed/where_did_the_industrial_revolution_first_occur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/221dc563-ce49-416a-9d41-8c88267bf6ac/how_much_coffee_for_12_cup_cuisinart.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_off0000c99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99D 5520 bytes
SHA-256: 9baad58e2fba6ba329d3725cf579b668f2c8627610f03b2c9226c4a7ae4b5e67
font_01_sfnt_off0000dc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 10392 bytes
SHA-256: 713a904bf12cf3fa61fb48dd8d021b67bc2b09e7400fa6c060c30cf80fca18ef
font_02_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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