Malicious PDF — malware analysis report

Static analysis result for SHA-256 728974d3178b185b…

MALICIOUS

PDF

77.8 KB Created: 2021-02-16 12:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0362f1a03d82c9aa2080cf4af167a37c SHA-1: ab869c2f4e61d2f28a49d7756748f024089ba96f SHA-256: 728974d3178b185b435ca64e192c5887aca938626d574a90a1b8a57b9d47dfe7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM'. One of the primary external links points to a URL that appears to be part of a phishing or scam campaign, indicated by the 'Pdf.Phishing.Trojan' ClamAV detection and ML classifier score. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to direct users to malicious websites or to manipulate search engine results.

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 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://jacksth.ru/strik?utm_term=top+10+cardiac+drugs PDF link annotation
    • https://wesuzijuto.weebly.com/uploads/1/3/0/7/130740493/9923432.pdfIn PDF document text
    • https://didekupava.weebly.com/uploads/1/3/1/1/131163833/damizobixede-fobizoda-gupizubapolofun-jekiserinupo.pdfIn PDF document text
    • https://lekusimije.weebly.com/uploads/1/3/1/3/131383821/3100646.pdfIn PDF document text
    • https://tilavulam.weebly.com/uploads/1/3/0/7/130739056/sojogi-fokugusodilowul-gomenaza-rikise.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zotuxegusam.epizy.com/47542356383.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/lisuwiwupabivimoxix.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/10981154735.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/artex_c406-_1_elt_installation_manual.pdfIn PDF document text
    • http://nodafawujanego.rf.gd/sutukonoxalupeno.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/memojiralizutugu.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/dufususibuluvaveworas.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/courtyard_hereford_film_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/68605454098.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/1695301388.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/a._n._m_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/88994326024.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE01 5352 bytes
SHA-256: 1181deb8a7d9406a206e911da3d1d701f67f3a445c79d448516feb94195c57e0
font_01_sfnt_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 10716 bytes
SHA-256: ad21d306320df2cc337ba5c3470e1f5396908eafc181cabb9543d2321a389d8c
font_02_sfnt_off000114ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EF 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8

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