Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa34aac38ce9ab5…

MALICIOUS

PDF

72.4 KB Created: 2021-02-23 14:32:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 40c79f58ce4a9b9096e28f2add2cee91 SHA-1: 733576e8b1a6e89cdc565437e92edeef03e54103 SHA-256: ffa34aac38ce9ab59be530e49270026834f7cd39599b35ee075ca5ebdbe3d34f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/strik?utm_term=cuales+son+los+beneficios+de+tomar+agua+de+romero PDF link annotation
    • http://podcard2020.site/zuwupodikiradanetad0mghc.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/ihdgh2b/10646240640.pdfIn PDF document text
    • http://itclick.info/54850738271z476s.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/gejjEWo/daxeninexowaf.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/iPTgiid/rocketbook_fusion_vs_everlast_vs_wave.pdfIn PDF document text
    • https://cdn.sqhk.co/bumadawab/c4HiaYE/93960736266.pdfIn PDF document text
    • https://cdn.sqhk.co/semoxumid/jBrT3Sj/kidirezijowuvebos.pdfIn PDF document text
    • http://creditscoretracking.info/30114056233p4ne0.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/nifTXii/mcmansion_tents_los_angeles.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/ifOC0jf/42952614775.pdfIn PDF document text
    • http://semengergel.ru/diagnostico_comunitario_y_sus_elementos7w3kr.pdfIn PDF document text
    • https://cdn.sqhk.co/givikufat/Cij1Ajg/wales_online_football_violence.pdfIn PDF document text
    • https://cdn.sqhk.co/patizuruf/bMmwhbT/fashion_girl_drawing_images.pdfIn PDF document text
    • http://kismykeitio.best/95846043751hdh39.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/fjgpGw9/rafozepowovixusixaduvoraf.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/10000_reasons_bless_the_lordiwl67.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/wusigipufuvowix/jamoka.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/william_shakespeare_sonnet_116_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/antivirus_apk_file.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_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 5384 bytes
SHA-256: 680c37bc9a668615914d47b8e2f7717bcbfec6f0810500ba142a7cf81973ede2
font_01_sfnt_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 11592 bytes
SHA-256: 857a094ae7b990c5c957573d56194b48bd734bae79a41ee5c64b8c206e8723ec

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