Malicious PDF — malware analysis report

Static analysis result for SHA-256 9211b66faf788f4f…

MALICIOUS

PDF

81.6 KB Created: 2021-05-25 09:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ad14857c57716e33e9a1d92998a29665 SHA-1: c68270cdb751352165675d0f44223a24b84b0360 SHA-256: 9211b66faf788f4fee74a98dd845a9c9fda02368c2f29b70162115c637e003e7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous external links, with a critical heuristic firing for a PDF link farm. One prominent external URI, 'https://leonvi.ru/strik?utm_term=la+vida+secreta+de+fidel+castro+libro+pdf', suggests a phishing or content-luring attempt. Although no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to potentially malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/strik?utm_term=la+vida+secreta+de+fidel+castro+libro+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366346/normal_602906d657b28.pdfIn PDF document text
    • https://wapojopaboxijok.weebly.com/uploads/1/3/4/7/134747084/zilifusodipo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409616/normal_6000eb9c30915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368506/normal_606a67b203a74.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/7ca313cdbf22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490133/normal_5ff5ea142a36c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422897/normal_606dc14092dfd.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/0cc758d0-676b-4c0e-a793-5b3c9f0b7aab/67226354975.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/mofavumigenaju.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/book_report_worksheets_third_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/lowibine.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/civilian_equivalent_to_military_rank_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7726fa17-50ab-40e9-bd4e-e131aebf05e5/naqaab_bangla_full_movie_download_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/takaxogomajofidupudosame.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/dapaxatefafebos.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/png_text_generator_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3319c99e-a807-4e31-b6cf-cb73aaead4a3/how_much_is_water_softener_maintenance.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/best_auto_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/125011551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6775061-d32b-447c-9fcb-b2b786762f09/8672494244.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/vujodizoxoviboguropakim.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/rojurevel.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 4972 bytes
SHA-256: 97ccd641b85da6d6e9300fa0bccf024d533610df0c12c644d7822548a5379203
font_01_sfnt_off00010573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 11552 bytes
SHA-256: f894b679aee447c88c43cb7b2024d72624602f96e0de6cb37892963f3b46eac6
font_02_sfnt_off00012adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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