Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f4afa4793ac12a…

MALICIOUS

PDF

67.9 KB Created: 2021-02-21 03:26:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: adc0732195136505a3c690a89ff371de SHA-1: f81d997aa2289ec8444ed8c9169f2f2b76248314 SHA-256: b7f4afa4793ac12a10fa6c2fd6e80cd79fb05edf0f8524462fcd771b9fa54896
254 Risk Score

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
  • 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/wb?keyword=t%20trimpe%202002%20sound%20and%20light%20answers In PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/gudezipowefax_purusapi_midira.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409113/normal_5fcd3b13274a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390660/normal_5ffd63cf0d264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394062/normal_5fe846c0a87dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_601145a7499e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446765/normal_5fe33279381ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484610/normal_5ff988691d437.pdfIn PDF document text
    • https://marodesama.weebly.com/uploads/1/3/5/3/135349202/sinasoxezubu-kinatopoboko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425217/normal_603022018f12b.pdfIn PDF document text
    • https://cdn.sqhk.co/vudararemane/gjgdJRs/93363813493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473415/normal_60125d6d84c83.pdfIn PDF document text
    • https://kaledawuvilef.weebly.com/uploads/1/3/4/7/134727412/lumibesuno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501360/normal_5fcad8f126bae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_600e086328f9c.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/wanalovum/best_way_to_answer_college_essay_questions.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_off0000cacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACC 5688 bytes
SHA-256: c9d09a86473c9f3e08637c08e26be27abf64db03cabea770fe274c307416fdb4
font_01_sfnt_off0000de02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 10984 bytes
SHA-256: 936739559f74ef8d8899c613dc7668871a23a775a4ef93b0e2d72551bcd14e52

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