Malicious PDF — malware analysis report

Static analysis result for SHA-256 851a031d87f7947d…

MALICIOUS

PDF

73.6 KB Created: 2021-02-24 00:24:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 24f98586260b1f957b670274544ca24d SHA-1: 01dec1a77f9920e77a541598e7005cafc40fbedb SHA-256: 851a031d87f7947df6b4a9c63d4866ffd536b613c49220d2381db867e995e3fa
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://leonvi.ru/strik?utm_term=who+is+the+narrator+in+barn+burning PDF link annotation
    • https://cdn.sqhk.co/jaruxabal/jSjadhb/6895500587.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/giMeijx/mafes.pdfIn PDF document text
    • https://puziwifatewir.weebly.com/uploads/1/3/4/7/134715637/05bfcd12.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/HickWbD/amazing_wallpapers_for_iphone_11.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/3OhfjjZ/temepaxulikidola.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/ibjcjbz/video_status_maker_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_601281fc76015.pdfIn PDF document text
    • https://cdn.sqhk.co/rokijatu/ibieFhj/12743779117.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/dchibij/monster_city_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/NCjd8gd/59771471720.pdfIn PDF document text
    • https://kanudepu.weebly.com/uploads/1/3/2/7/132740929/4a50bd.pdfIn PDF document text
    • https://kegotewu.weebly.com/uploads/1/3/1/4/131437679/9417349.pdfIn PDF document text
    • https://cdn.sqhk.co/purovufizu/idvihBX/dotafulibem.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/bezutu/83156499542.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/xisobexarevuxoriwem.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/principles_of_curriculum_design_and_development.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/66433010261.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/online_cartoon_maker_apk.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_off0000e3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FF 5068 bytes
SHA-256: 93dee97b0e929fbaaff80e58bd713d54846f7d35aa161fbb755d2513abb73516
font_01_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 10532 bytes
SHA-256: ac489769a1e832ed02474b4b817113c59e505d634c9077513eb18d3cca23d4b5

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