Malicious PDF — malware analysis report

Static analysis result for SHA-256 8111aed87a2be1b0…

MALICIOUS

PDF

66.2 KB Created: 2021-02-26 07:25:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: bfa425eac9859d1d41558c227cdf32d2 SHA-1: 8549e4196dd69eb8816c4215e79c1057f324bee1 SHA-256: 8111aed87a2be1b080591f55c3d1d6c92ec7e3d13383fb054ced22dc82de202f
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/award?keyword=how+to+sync+afterglow+ps3+controller In PDF document text
    • https://xobawaxotax.weebly.com/uploads/1/3/1/4/131453143/4487628.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476601/normal_5fffc2bf61b52.pdfIn PDF document text
    • http://gilitomenuxame.22web.org/nike_size_guide_clothing.pdfIn PDF document text
    • https://gopogaxewose.weebly.com/uploads/1/3/4/0/134013169/50a2018000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_6015de3245b4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372696/normal_6025985d141d0.pdfIn PDF document text
    • http://jedugefipevama.iblogger.org/duforipozadagivumuxifepun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_6013bd1c1180c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446015/normal_5ffdbd5aaf58d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451927/normal_60382ecec3022.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/vibasujefir/xaxevalidasetabi.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/enrique_s_journey_prologue_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/how_to_determine_stihl_chain_size.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/avidemux_windows_10_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/9421411332.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/kafeberanirevu.pdfIn PDF document text
    • http://tolerikaduvutef.rf.gd/carreras_universidad_del_tolima_sede_popayan.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_off0000c5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DB 5500 bytes
SHA-256: 8c958c677a23fb00f43425c7dff981137853eb3e12e80a0ff579836842b27525
font_01_sfnt_off0000d8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C8 10428 bytes
SHA-256: 6071570bc61308754419605f85d2865551f0119cce6918f4b0a299c26a9b940e

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