Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1dc4b4a6622937c…

MALICIOUS

PDF

69.5 KB Created: 2020-11-13 09:58:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8881d12758d2ea8d710c4d0735841c69 SHA-1: 62b2104c6017b090680ce3843b5bb5ff7a0d569f SHA-256: b1dc4b4a6622937c58c0802f8a2b0ec90e887938835c27ee0ec9109dcd8ef17c
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic firings indicate the document is designed to link to external resources, likely to facilitate phishing or download further malicious content. While no scripts were extracted, the presence of multiple external links and a critical redirector alert strongly suggests a malicious intent to lure users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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
  • 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.
  • 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.
  • 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=girl+scout+parent+handbook In PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rezareludufiven-voxodopi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/arya_2_movie_bgm_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/flamenco_guitar_method_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/92610681966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d5a2da4-a59c-4c45-b3eb-62150eca00a2/18388709952.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/prairie_hills_elementary_school_supply_lists.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0e29e32-ebb5-469d-bf7c-753c3d87ae93/brake_places_close_to_me.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/46256128384.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D3 5276 bytes
SHA-256: 4e67a471681aecabf5b25de6d217532c486df5671b583f6bf65a7eb7f3d961a3
font_01_sfnt_off0000d8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 10208 bytes
SHA-256: baa7a7de7a0d4d1c2c7f09248aa05584c2d53096f51a4c96920030dcdfdfcbbe
font_02_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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