Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c24fe44a13b44d…

MALICIOUS

PDF

79.4 KB Created: 2021-02-15 06:32:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c17c55c747860f63e574321ece333d93 SHA-1: c92760e44be97bc19e9da0466c9a90672cc5a401 SHA-256: f0c24fe44a13b44dce2c451e435ed5fcdcfa4a50efadf3bb8a96378663765002
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF files, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a malicious intent to redirect users to potentially harmful sites. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://seumenha.ru/wix?keyword=new+google+sites+embed+iframe PDF link annotation
    • http://magicwoolshop.com/tumuguzajilizuziwa406bu.pdfIn PDF document text
    • https://mutazodot.weebly.com/uploads/1/3/0/8/130874237/dodelisagapawemudu.pdfIn PDF document text
    • http://sdek-24.cc/teachers_pay_teachers_gift_card_giveawayqf88h.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/uEzjbjh/trainheroic_app_free.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/dhdifhd/bowelitim.pdfIn PDF document text
    • https://cdn.sqhk.co/xoberuweri/hiiaSia/psplay_unlimited_ps4_remote_play_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/eRhehhc/94760366674.pdfIn PDF document text
    • http://medtechnika1.ru/motiwafbsxny.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/ibjaClz/lokogebixepibu.pdfIn PDF document text
    • https://cdn.sqhk.co/bavomizobe/ifE1ges/xegozijonumovesufejano.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxarabo/hFighf3/copper_price_chart_for_last_5_years.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/jjfIrsm/hello_neighbor_switch_gamefaqs.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/zukogi/73922633164.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/sidegagorodofo.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_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 5108 bytes
SHA-256: c61c3d37ced2cefe73e051d6d38602cce1e306c30969b6331b461ab3cfec323a
font_01_sfnt_off0000f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 14812 bytes
SHA-256: b0749bb54833e710726c609d3489a0d307e4bbcc243043ecf3d090e974f539a6
font_02_sfnt_off000122b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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