Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a737e3c7d67eb1…

MALICIOUS

PDF

76.1 KB Created: 2021-02-09 22:02:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d81d2e7323f50b46d1d4b44487244be8 SHA-1: 7531e2234c46d9da3dbae2667fa0dc52957c556a SHA-256: c2a737e3c7d67eb16fbc10692da479d0a64f2b4dcc83b078809c638e20411ed1
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=gate%202020%20mechanical%20engineering%20syllabus%20pdf In PDF document text
    • http://lassituda.online/vabujaxusopefikuhse3m.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/2Dgghjd/nigorimonujifuwufugubeto.pdfIn PDF document text
    • https://lisomoduxu.weebly.com/uploads/1/3/1/3/131383329/dutemutirez_vonekogabufixiw.pdfIn PDF document text
    • https://rifubagozoj.weebly.com/uploads/1/3/2/6/132695416/9278186.pdfIn PDF document text
    • https://puvomowaja.weebly.com/uploads/1/3/4/3/134318832/rovojuviwaz_duseb.pdfIn PDF document text
    • https://jasedulenenude.weebly.com/uploads/1/3/5/3/135328633/dc33c5aa58da7.pdfIn PDF document text
    • http://goodnaturak.space/56216413992frhvs.pdfIn PDF document text
    • http://table-wait.com/sensitivity_for_pubg_mobile_emulator0h12m.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/zalomi/bujox.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/skills_gap_analysis_template_xls.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/66170457342.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/22045857730.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/mudukovagisavo.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/biochemical_oxygen_demand_wastewater.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/xofamobexirulefegukuremos.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_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 6116 bytes
SHA-256: c5fa98530ce96ef8906b61a61477138dab2081667f3a4ab6b0eaf0eeaad30a38
font_01_sfnt_off00010043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10043 10424 bytes
SHA-256: 9035da9c38e43628afbb905beeff475e61c4ef11f1acfadcc7efb103c0d6b2f9

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