Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57d861c79d504f9…

MALICIOUS

PDF

113.6 KB Created: 2021-02-26 14:44:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed263be7d83f3e5ad305899a17f487d4 SHA-1: 783c979a5d6e266583a8f4f3ecb8ca14c35e111e SHA-256: e57d861c79d504f9a3a88096de5b5dc0a1f6cbf175de8eadf02d2739767427fd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one critical heuristic identifying it as a link farm. The primary URL, https://soxebez.ru/123, is suspicious and likely leads to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=pasos+a+seguir+en+una+misa+catolica
    • http://powerpoint4you.ru/guitar_caged_systemkaobf.pdf
    • http://liketime.online/does_hulu_have_crazy_stupid_lovekvx1f.pdf
    • https://cdn.sqhk.co/lepitajirel/7HhCgia/32883376148.pdf
    • http://juvozukatug.66ghz.com/21732913818.pdf
    • https://cdn.sqhk.co/pedajobu/heT8ic1/spaceflight_simulator_interplanetary_space_station.pdf
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/sazuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rizezobabub/55327659202.pdf
    • https://s3.amazonaws.com/rimejiguvif/zizade.pdf
    • https://s3.amazonaws.com/gekojulog/inej_ghafa_six_of_crows_fanart.pdf
    • http://rutuvofogiseba.epizy.com/arduino_mega_2560_rev_3_datasheet.pdf
    • https://s3.amazonaws.com/dewazewokib/calendrio_2019_em_excel.pdf
    • https://s3.amazonaws.com/jepavilutabilel/milaxuxepup.pdf
    • http://mapixuxiloko.epizy.com/vefusokapamunejokitumepok.pdf
    • https://s3.amazonaws.com/gatazeromij/48968983954.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018073.bin
137e4ab1120b0be3ac4df3b826531cce11a464e0c2c618d582004ea16ee7c46c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18073 5120 bytes
font_01_sfnt_off000191c7.bin
24f540292bf9b8c80cb8bc6dc3338330e411e2342c9632ec6ed4a99366463cd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x191C7 12132 bytes

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