Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a284df764324454…

MALICIOUS

PDF

73.8 KB Created: 2021-02-04 18:43:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: ec3e34c2b4839360e057e985812d0391 SHA-1: 7939531d7a868a757c06ce83f6a52b03ba72fdda SHA-256: 4a284df764324454e537ad74f3ab4981cfd83ba2eee7f869d6fbbd94ae9b705e
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wb?keyword=london%20vacation%20travel%20guide%20expedia PDF link annotation
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/ae69b4779177.pdfIn PDF document text
    • http://wiinorama.space/past_tense_worksheet_for_grade_3sw6wp.pdfIn PDF document text
    • https://zizopozuwugova.weebly.com/uploads/1/3/0/7/130775786/75f9426c2742a64.pdfIn PDF document text
    • https://jitemino.weebly.com/uploads/1/3/0/9/130969659/d1a674cf33fc.pdfIn PDF document text
    • http://file-id.ru/bibiwajegikutiqg4u.pdfIn PDF document text
    • http://yogistika.space/off_road_4x4_hill_truck_2019r3wok.pdfIn PDF document text
    • https://xerupirep.weebly.com/uploads/1/3/1/4/131408033/jovadelejotik-rumosed-nejevumivo.pdfIn PDF document text
    • http://mikrotikwizard.com/typology_in_the_bible6eeze.pdfIn PDF document text
    • https://mifimixaxenerut.weebly.com/uploads/1/3/3/9/133999571/zepimabo.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/3172959.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/zufaxepixiguxax/38852547143.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/34339872934.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/weather_report_today_goa.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/33665639860.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/psychology_final_exam_questions_and_answers.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_off0000e24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24E 5132 bytes
SHA-256: 9f6c1d152c5e21b91e5b6c7f0da820539b205e7d56db6d49f82a885a2aa03f02
font_01_sfnt_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 11592 bytes
SHA-256: 87d5551e35d78267851b73dc7269d92d60c389a5453cbc36b221f60cd8c0f060