Malicious PDF — malware analysis report

Static analysis result for SHA-256 5228b23cd062cf2b…

MALICIOUS

PDF

72.5 KB Created: 2021-02-15 21:04:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ffe0f28ab57ad7e6ddcfb6ebf7a5f688 SHA-1: 20da75cdd27acf9cbf59dc2943fb379628f068aa SHA-256: 5228b23cd062cf2b61511221234d3495565ecfe56f7590b6c37124b6b161101a
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to redirector domains like 'baarspo.ru' and 'fojumujitugesi.weebly.com'. These links are presented in a way that suggests a link farm or SEO manipulation tactic, often used to disguise phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://baarspo.ru/strik?utm_term=enfermedades+sintomas+y+tratamiento+del+sistema+endocrino PDF link annotation
    • https://fojumujitugesi.weebly.com/uploads/1/3/4/6/134688065/8867870.pdfIn PDF document text
    • https://diwujuxopawarow.weebly.com/uploads/1/3/0/8/130874606/2658977.pdfIn PDF document text
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/suvumoxesodafuw-pasusakobe-kanuniwiwu.pdfIn PDF document text
    • https://witomoniwitu.weebly.com/uploads/1/3/5/3/135317652/a772203685.pdfIn PDF document text
    • https://timemojorejo.weebly.com/uploads/1/3/1/4/131437846/wigenumosaxokukex.pdfIn PDF document text
    • https://jobuvurivoko.weebly.com/uploads/1/3/2/6/132681743/ribuno_notupafuleku.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/bulalowisu/abcd_movie_video_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/1997_coleman_fleetwood_pop_up_camper_weight.pdfIn PDF document text
    • http://vipowiso.epizy.com/zifevumemumobex.pdfIn PDF document text
    • http://vonanovab.epizy.com/safabin.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/graduation_speech_template_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/allergic_rhinitis_treatment_guidelines_2017.pdfIn PDF document text
    • http://lajuloverebob.epizy.com/kepudijisapidojoz.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/kgf_tamil_songs_starmusiq.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/dafofelawiredeporaxafem.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/11787230803.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/amplifier_software_for_pc_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/jefajodomule.pdfIn PDF document text
    • http://vukefuxi.epizy.com/34373750401.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 5224 bytes
SHA-256: eae06bdc2d01cf6e73b3d0d1ddb927da8fffd3fcbc9fb2dc6647447996e11c4a
font_01_sfnt_off0000ed5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 11344 bytes
SHA-256: 0dd2b5c87a9ce4311cac8bcf821c038d1dda163b021c9fa3d971eea6fb3d0b77

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