Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8482efad2ae2de…

MALICIOUS

PDF

65.8 KB Created: 2021-02-08 01:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 1a399250b996315794063994197b6697 SHA-1: 446185eb38c8213f54d4c8f4004d1882fd7cbf6f SHA-256: 7a8482efad2ae2def9fe3f18c2ed86ec6b9c67fb676558e157625847d8b1cec5
254 Risk Score

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/wb?keyword=how%20many%20worksheets%20in%20a%20workbook In PDF document text
    • https://bigudiwox.weebly.com/uploads/1/3/5/3/135304820/sofitufuz.pdfIn PDF document text
    • https://deremorukoj.weebly.com/uploads/1/3/4/4/134490203/028f25b2ac8a2a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376088/normal_5fdf1c4143f1f.pdfIn PDF document text
    • https://mafetoga.weebly.com/uploads/1/3/0/8/130874134/fufabejitekuxos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411493/normal_5fd8995432624.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/xonobijikivo/zatubez.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/70089474541.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/the_history_of_ancient_rome_worksheet_answers.pdfIn PDF document text
    • http://nupepepasis.rf.gd/jofiz.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/sijawele.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/84865242852.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/23102876994.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/43783352445.pdfIn PDF document text
    • http://tibibexubedumu.rf.gd/golomuj.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/livozozopusofalukidofop.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_off0000c533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC533 5252 bytes
SHA-256: 484602fc964c27a92ad4a1d42be5a545ac81c6629846efeebc28c921d240d9d1
font_01_sfnt_off0000d6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 10384 bytes
SHA-256: 1543049d4509ff2d1c2073fa428567310910c2a4b883873b560d47e7cacfd903

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