Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00d4c6985db7c19…

MALICIOUS

PDF

71.2 KB Created: 2020-11-17 05:14:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4250b4794e8c42bb6cc7acf7802544d SHA-1: 1fd9cb8d234ab843cca5838957d2df8f63dac918 SHA-256: d00d4c6985db7c19845f1da245f5876b9c7ae574cac15c9562801c4f38192172
244 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure and a large link farm on disposable hosting. The ML classifier and ClamAV also strongly indicated maliciousness. The embedded URLs suggest a phishing or redirection campaign, likely aiming to lead users to sites that host malware or solicit credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=partes+del+ojo+maquillaje
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/davuseguxiv.pdf
    • https://cdn-cms.f-static.net/uploads/4380695/normal_5f8c0496b7d41.pdf
    • https://ramipataxeki.weebly.com/uploads/1/3/4/4/134483057/958588.pdf
    • https://xekozetona.weebly.com/uploads/1/3/4/5/134508060/dudupidubis.pdf
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/32eee4b9.pdf
    • https://cdn-cms.f-static.net/uploads/4401538/normal_5f9fd92d1ecbf.pdf
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/ffc40040a9e2.pdf
    • https://rizafoxuz.weebly.com/uploads/1/3/4/8/134852064/teweniwari.pdf
    • https://sasenepekevob.weebly.com/uploads/1/3/4/2/134266747/fagit-nixurunakub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bifamomove/90231238583.pdf
    • https://s3.amazonaws.com/muvojugejoxip/nitefad.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c23a.bin
73aa46ff1b38dc2d8836a4ab87970d55f6857392f063976d7824afa1cef6ab73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC23A 5176 bytes
font_01_sfnt_off0000d3bb.bin
3e2f8bd8fb59a2c42cc306f540a966102ef59f6ee23d692c00a32a4f98f183d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BB 11396 bytes
font_02_sfnt_off0000f8ea.bin
b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 16312 bytes

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