Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f81f8616b9f857…

MALICIOUS

PDF

72.0 KB Created: 2021-02-27 23:31:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 0a942ae9573e2189ef4c9aaccfe97874 SHA-1: 2fe766f7d269fb1bcb6a5ba7988229e1d939ab94 SHA-256: 76f81f8616b9f8577fe2f591afbb6bc09481b8776f0f904b83497693571203a0
196 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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://kuzutuzo.ru/award?keyword=norcold+refrigerator+1210+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464532/normal_602dd75ec2271.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/Qjdgggh/tomb_raider_movie_review_roger_ebert.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/KAibZ5y/space_raiders_rpg.pdfIn PDF document text
    • http://copyrightshelpcenter.com/43481668237wegoe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494166/normal_603a9a2892e4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417998/normal_5fec0ba6e9222.pdfIn PDF document text
    • https://levufiturosotin.weebly.com/uploads/1/3/4/4/134466711/nusekuwoturile.pdfIn PDF document text
    • http://savadaqwe.space/shapes_worksheets_for_nursery8oxn1.pdfIn PDF document text
    • https://zixijatujomalul.weebly.com/uploads/1/3/5/9/135962278/7835950.pdfIn PDF document text
    • https://jugafuxuxeg.weebly.com/uploads/1/3/2/7/132740719/vobadarozijun-jopunisijili-sugijuvimoze-lelija.pdfIn PDF document text
    • https://sagojuxejuzogug.weebly.com/uploads/1/3/4/5/134598596/6aca522ff0d191.pdfIn PDF document text
    • https://dapunilak.weebly.com/uploads/1/3/4/5/134506399/rategefimo_kawazakixipor_pazeki.pdfIn PDF document text
    • http://deine-gabe.com/croydon_council_tax_refund_formt6uwo.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/jodabiladezot/ruzisomamotovepono.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/5th_grade_math_final_test.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/38907189331.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/58277149038.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_off0000de17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE17 5456 bytes
SHA-256: 4d1fafed372fe27fdf4a773c55e104b51c051a7593a18fd47acbf5ce379e8764
font_01_sfnt_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 10348 bytes
SHA-256: 0316f8147af9c5837c18315a066c24c43a19cd9f23e28501506011546a9de865