Malicious PDF — malware analysis report

Static analysis result for SHA-256 852ba08824fd4886…

MALICIOUS

PDF

81.0 KB Created: 2020-12-28 22:35:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 365643aab4503f4c96eb0343ab8a80a0 SHA-1: 2f713e798f2441b03efcfc4c8f57f9953ea8c1c2 SHA-256: 852ba08824fd488639c98f19d5fcb5138c6f12b7367093e93bf87533815079d1
194 Risk Score

Malware Insights

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

This PDF file contains a link that redirects to a known malicious URL, identified by multiple heuristics as a redirector for phishing or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=great+hall+of+the+bulls+date In PDF document text
    • https://nelurorinubix.weebly.com/uploads/1/3/1/3/131384252/pejojudibonaranuxuki.pdfIn PDF document text
    • https://cdn.sqhk.co/jozanafe/ghmyp9u/famivuposomobuxasugepug.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/dibedamoka/ekadantaya_vakratundaya_song_ringtone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9df87c6e-8bb2-4b27-8d46-13b3b71edd4e/kozafexujufe.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/53511016798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53f63ca8-9aba-48d2-a171-fa8b7d8c560b/voltage_drop_calculation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e2b651-aab2-4164-b778-5dceaef3ebc5/kenwood_dpx300u_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/acca_f5_performance_management_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cde31f9-1d7e-4383-9419-c1f66abceedd/astm_a484.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/bushnell_telescope_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1206e577-d55b-4374-9e9f-b337654d854b/how_to_isolate_a_variable_in_the_denominator.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/tanizovubuzilukibawoj.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/kelezeraloki.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_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 5168 bytes
SHA-256: 8f3ce42cbfb6af4c84fa6e59055023dc2d1e20eaa22407bad1378fa08fad335e
font_01_sfnt_off0001129c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129C 10876 bytes
SHA-256: 26e138e8b9a93743f8eb680a00f14a478d52ab62e90cd3e0c8add092d3562f09