Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f65e6bac60a93b5…

MALICIOUS

PDF

65.5 KB Created: 2021-01-14 11:01:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 781f0b6e63e8959b2643148f876d1ce7 SHA-1: 95d2d1305f39cd7bf814c265c70ca3677e6af042 SHA-256: 2f65e6bac60a93b51d2e792ab5e7f44e59c53e7e5416ec516b2cc81382c02b2b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs point to potentially malicious content, including executables disguised as PDFs. The document body, though heavily obfuscated, appears to contain metadata related to Fiori guidelines and wkhtmltopdf, which is likely a lure.

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://traffset.ru/aws?utm_term=fiori+guidelines+select PDF link annotation
    • https://cdn.sqhk.co/zufuxirap/x9kijhi/green_force_unkilled_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/mghwgea/invaders_from_space_starman.pdfIn PDF document text
    • https://revawowi.weebly.com/uploads/1/3/5/3/135317167/4521402.pdfIn PDF document text
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/db7f40529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473645/normal_5fb616a003ecd.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/MZpjhjf/17705094240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448137/normal_5fad8abcd89d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5fcb36a600009.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491723/normal_5ffd78484bf3e.pdfIn PDF document text
    • https://cdn.sqhk.co/firokizita/jeuheYF/spinach_artichoke_dip_menu_description.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/gdniNak/kotin.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/jfIfijj/89012115229.pdfIn PDF document text
    • https://zejuwotozago.weebly.com/uploads/1/3/4/6/134647352/0b79d744b73a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC843 4852 bytes
SHA-256: d394bb530cb897925c9087389a1b826261c9bec5abca68e46d6328ecd250374f
font_01_sfnt_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 9588 bytes
SHA-256: d33b15d3bdb26ff4f301e04223573e5506f6ea304cad414ade56dac4df481626

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