Malicious PDF — malware analysis report

Static analysis result for SHA-256 4053d3b7dc6eb669…

MALICIOUS

PDF

64.9 KB Created: 2021-02-26 01:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: b853118511a59ca09619d2be49c17589 SHA-1: 5937b8459d8e63ff053ce43854488abb99e72653 SHA-256: 4053d3b7dc6eb66987376be2a57f666eb5f3d03eb8154c11afc417710b68202a
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://baarspo.ru/award?keyword=what+level+is+amelia+bedelia PDF link annotation
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/tevijowulebezi-revadefirula-riloledidezif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427811/normal_60185e3e806cb.pdfIn PDF document text
    • https://cdn.sqhk.co/raserijene/edigqia/ruwavef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410443/normal_6004f31e1c6c5.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/bG3jdgj/strategic_management_dictionary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368224/normal_5ff8afabaf3a2.pdfIn PDF document text
    • https://cdn.sqhk.co/widiroje/chanThd/game_room_ideas_for_basement.pdfIn PDF document text
    • https://cdn.sqhk.co/vejurumilef/p7gdlhd/amc_24_palm_construction.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/iWnOgil/bird_sanctuary_nyc_island.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://worizekadi.epizy.com/environmental_impact_and_risk_assessment.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/fifubujelazejelof.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/73625428689.pdfIn PDF document text
    • http://lefamuredemupi.epizy.com/57296189409.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_off0000c221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC221 5184 bytes
SHA-256: c5559d4644f32ec17387e18c10c9978e56266118c438951483c6c94d87061142
font_01_sfnt_off0000d3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AA 10296 bytes
SHA-256: 12d8e4d6f5a05df50869ef884f4e767f586f3ec17cc4b6031c49726784b1c35d