Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ae81e410ec44c3…

MALICIOUS

PDF

70.5 KB Created: 2021-02-22 13:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 8816a2782118481a66740c474c923cc4 SHA-1: e5234e2b3a9e85779eb08b27427f68a9f8750efd SHA-256: b4ae81e410ec44c3a015cc9523d395cfffc8c245deca8b827b716b2cf73e4fcf
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/wix?keyword=a+long+walk+to+water+crossword+puzzle+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414672/normal_5fd78da3233ad.pdfIn PDF document text
    • http://fuziral.iblogger.org/tesukogatusisejozujuzalon.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/jhzhqgi/pianista_trailer_ita.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412900/normal_6029d1b43b5c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_5fd64c515659d.pdfIn PDF document text
    • https://cdn.sqhk.co/puruwedisuma/vifiigg/picture_perfect_crossword_chapter_4.pdfIn PDF document text
    • https://fexalikinuzumow.weebly.com/uploads/1/3/5/3/135324316/2464648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383913/normal_6018c8cf4eab2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_602cb2eadaaaa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365553/normal_5fde003dbf21e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403283/normal_5fe2f71716b67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376382/normal_6012a482bdce4.pdfIn PDF document text
    • https://cdn.sqhk.co/rabovafom/grif74U/95292618894.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwifudu/cgijdhj/wamojiwijipetibigi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pezuxegoweniger.epizy.com/pawabasupewalidodaba.pdfIn PDF document text
    • http://nutogexutal.rf.gd/sabepeluxevetodujol.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_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 5540 bytes
SHA-256: 9124349bd01df2a4f5e1dd3b1a9692f746ec1c81df6797c39f926ee32dca9ccd
font_01_sfnt_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 10072 bytes
SHA-256: 4b90a62a67d219c12db28936d552a66f337d18cacc6cbb476a7a1170a973e5eb