Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ceb21974765f035…

MALICIOUS

PDF

94.1 KB Created: 2021-02-21 21:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 233296efbf12a5b4e66f4dfd2b2e6dc1 SHA-1: b6cfa3b2ab89b27c0a84fe0c9b28e10fcb2c3e15 SHA-256: 9ceb21974765f035dcc74e68f90d7f11bc642fba93a75b2e6c93a8356adf5ed3
254 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a redirector link and an SEO link farm. The embedded link `https://yafferge.ru/strik?utm_term=tales+of+a+fourth+grade+nothing+fudge+character+traits` points to known malicious infrastructure, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to its creation, but the primary malicious intent is derived from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://yafferge.ru/strik?utm_term=tales+of+a+fourth+grade+nothing+fudge+character+traits In PDF document text
    • https://zifakilis.weebly.com/uploads/1/3/2/3/132302733/822980.pdfIn PDF document text
    • https://cdn.sqhk.co/wirumedaba/4hbje99/dual_survival_cast_where_are_they_now.pdfIn PDF document text
    • https://vesetiwavulajed.weebly.com/uploads/1/3/1/3/131381055/29c25312e7b7a.pdfIn PDF document text
    • http://1xbets-reg.site/how_to_replace_maytag_neptune_dryer_beltcvyxy.pdfIn PDF document text
    • https://midodelawipage.weebly.com/uploads/1/3/4/5/134585137/644824.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/CPYCjfd/gupapelor.pdfIn PDF document text
    • https://jutonoxefakevuw.weebly.com/uploads/1/3/1/4/131454335/e574c0221d4a10.pdfIn PDF document text
    • https://cdn.sqhk.co/jojipimuve/2ibIjaB/logujikitijoke.pdfIn PDF document text
    • http://starconflict-game.ru/nerudawogajupawetevivar1i4qj.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/lorugipopuxe/66360170128.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/grapecity_activereports_license.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/rukigadenogilaji.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/whatsapp_status_video_free_love.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/osteoporosis_guidelines_canada_2018.pdfIn PDF document text
    • http://vopapokolozanum.rf.gd/hyrule_warriors_adventure_mode_items_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/harvard_business_school_citation_guide.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_off000135d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D3 5232 bytes
SHA-256: 5ba222bb628ad99af9869c7346d434c38dff92e8d9d0b6aef53ab3728af96584
font_01_sfnt_off00014796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14796 10268 bytes
SHA-256: aa9e74318c6eb7d6ecead1f5ee2d1134202cdde43000d5dda2d83a908db36efd

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