Malicious PDF — malware analysis report

Static analysis result for SHA-256 755b9b9871e1f0f4…

MALICIOUS

PDF

67.3 KB Created: 2020-12-05 09:11:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d9d97945477a35f94216097a7eb1ca78 SHA-1: 176da3826a216a7733d005febb604fd47415905d SHA-256: 755b9b9871e1f0f4167afa26f7ca4e227490d411db8e52333feaf17a3856a68e
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 0.9998

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
  • 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://traffine.ru/123?utm_term=sims+mobile+mod+apk+unlimited+simcash PDF link annotation
    • https://xagomutub.weebly.com/uploads/1/3/4/3/134321984/xesufitogos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369141/normal_5f87cb2b60fee.pdfIn PDF document text
    • https://rimibike.weebly.com/uploads/1/3/4/6/134636102/jamofolobuwut-pijeje-vurafejazi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469105/normal_5fa5b07661531.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/f7ebf117-68a6-47f5-afa3-38a45df1f211/xixijekexovurufetemurekep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/896eef45-d951-4d6e-9ae6-6caef1cb51e0/96010767151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e0f7d8-fef6-4899-b856-b962ba35a9a4/67374594502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5eb030-f18f-4eb4-8739-f951e56cc0e9/kuzisifowe.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe2699f8cdb769c6aca355/1606297241638/bowflex_power_pro_xt_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/691683628.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2f3b9a5bc066edfb302dc/t/5fcad3b711c29807e6cbdd0f/1607127992102/55093930774.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ebd09955c744b53ba8af/t/5fc562dc4e98326c02c63dee/1606771422188/narigenuk.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/28337177086.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5da8d3dfdd95b60f715bd/t/5fc6f75f7995075abdd7571e/1606874976108/nofekefamafikogarotogi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4c483abaecd33183b024d/t/5fc770125060c93fcd7e3ee1/1606905875345/extreme_drag_racing_mod_money.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_off0000c69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69F 5524 bytes
SHA-256: 0e357e0e91f17dc7f84e85dfbe720301e01a4e826a213f0d14a35c95c366b742
font_01_sfnt_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 13072 bytes
SHA-256: 8c2095858bf5b1b3e211f0fd8ad000b7bf48d5f262e62698cacc5cf27f58c862

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