Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4918c157fe7fedd…

MALICIOUS

PDF

73.5 KB Created: 2021-02-25 01:03:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 55c2e75b9c59978e8ca2fa2851f1c84f SHA-1: 21d2afec5cd428c1a0f77ef13da61528eebf2754 SHA-256: d4918c157fe7fedd2ecd0cffdcf28e897d7f7a5b672b99acc40c4fcd8987c768
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://leonvi.ru/123?utm_term=does+verizon+internet+require+a+modem PDF link annotation
    • https://fuluposusiziz.weebly.com/uploads/1/3/5/3/135321682/vijovomukid.pdfIn PDF document text
    • http://termometr-medikal.site/fosekh3ofh.pdfIn PDF document text
    • http://movoxazukum.22web.org/botokobixetivufide.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/bd34428.pdfIn PDF document text
    • https://cdn.sqhk.co/gebunemif/yJ6h4gf/55534213787.pdfIn PDF document text
    • https://cdn.sqhk.co/vovomafejuwa/DagggcR/lemixokobuv.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/jelly_belly_flavor_guide_printablemj9fw.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/jggjiia/viruni.pdfIn PDF document text
    • http://getyourscore.info/how_to_learn_photography_for_freejs1tb.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/jefazaxal/77064996892.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/lisuvipowarojelimo.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/diagramming_arguments_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/australia_immunisation_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/puffin_browser_apk_cracked.pdfIn PDF document text
    • http://tovezujatim.rf.gd/80041481763.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_off0000e262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE262 5176 bytes
SHA-256: 95781fc4580b9bb2ed7374f6e5a2db33aaf8252430782fcad9c4e08c7bdfd0f1
font_01_sfnt_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 10896 bytes
SHA-256: ff4cf239b26c8121c0e008fccec0998d13be4c7b5707ae2504ea8fe3ba4ac644