Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc3d34b0aa8bee8…

MALICIOUS

PDF

79.4 KB Created: 2021-02-26 19:22:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 22b9a6c6734268ab8964ec5256a2331e SHA-1: 274e3f8ed0fbcf24a1237fbc628f62c00188937f SHA-256: 5cc3d34b0aa8bee8f9d944cf15f50c9f05348f54d9dccad6f98ce8a848a425a3
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an external URI pointing to 'midufefew.ru', which is suspicious given the context of a 'study book'. The ClamAV detection and ML classifier strongly indicate maliciousness. The PDF also contains a link farm heuristic, suggesting it's part of a larger SEO manipulation scheme to distribute malicious content. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=pak+study+book+9th+class PDF link annotation
    • https://cdn.sqhk.co/folamudoj/Usa0Xr1/speedy_cash_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/PwcVhjB/i_wish_lyrics_one_direction.pdfIn PDF document text
    • http://bugamuwilozibil.22web.org/baris_dan_deret_aritmatika.pdfIn PDF document text
    • https://firajapototirop.weebly.com/uploads/1/3/1/4/131452771/divefowogeb_vemazumonose.pdfIn PDF document text
    • https://nujobivodiji.weebly.com/uploads/1/3/4/7/134771327/sukaloxavigerivif.pdfIn PDF document text
    • https://cdn.sqhk.co/tasaxasup/hjNjjhj/radulure.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/planeacion_estrategica_personal.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/fiihihf/fiwaxemisejajag.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/godoremitiwuja/19899048610.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/81403427575.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/conflict_of_interest_policy_nonprofit_template.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/the_oxygen_thief_audiobook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/78907028137.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/69065201714.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/fovugekizufadatifabeze.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/3d_cabinet_design_software_free_s.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/sajoxojoburivixex.pdfIn PDF document text
    • http://tososite.onlinewebshop.net/the_lovesong_of_j.alfred_prufrock_poem_summary.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_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 5396 bytes
SHA-256: 1b6a525e02090edbf9f55be9cdc7a6422d27354d64faf6515289490dc958204a
font_01_sfnt_off00010cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBF 10592 bytes
SHA-256: dbd9c57fdd6a3f08880479ae585e3713924c450725ab40591fde826fdd384064

Open this report in the interactive analyzer, or submit your own file for analysis.