Malicious PDF — malware analysis report

Static analysis result for SHA-256 989dae75db226538…

MALICIOUS

PDF

66.5 KB Created: 2020-12-15 05:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f23c896a06fda8c14c139cdf54aeecee SHA-1: 1c0368eee17927e7fac17a6829c370ed7e4c8031 SHA-256: 989dae75db2265384ecd6e44f4fece020d620b7f7ff48b1972b6070f8410ad53
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score further indicate malicious intent. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=skywalker+for+free PDF link annotation
    • https://niginijepajenok.weebly.com/uploads/1/3/4/5/134505752/foralinubub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470040/normal_5fb6af08c572b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_5f8ff204174a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454995/normal_5faafded36c36.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/mawesenasijoser/sajagis.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc100ee92c50b1a1e781c95/t/5fc55daea97599144eac4ebe/1606770095878/46363455373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3358b4aa-0ddb-49d0-b4aa-131d3d7060b2/nuwudonepivobugud.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc568dc239b0722914f7edd/t/5fd60fb989566e781f460034/1607864250321/mavonuk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fceb98df527e820f03c15a0/t/5fcfc280ee509f2e4dd5ef4e/1607451264462/coin_master_hack_2020_ios.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf50719b1ed03538d19b6e/1606373489980/xemexuvijavavisiwetatekek.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc544960b6b03258f52273b/t/5fcd364283d2ac65cc1e442b/1607284296557/destiny_2_best_warlock_dawnblade_build.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_off0000c68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68E 4944 bytes
SHA-256: f56986366ae039a51c97b9f4b852d5973b6cdd79333cd56dc92772f2145343f1
font_01_sfnt_off0000d791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 11244 bytes
SHA-256: 8839a095721e07bc9359f4fcd50a54a1f62c980c586d5937060e3db4ee3a85ba

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