Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f99f1468c7021c5…

MALICIOUS

PDF

75.3 KB Created: 2021-03-01 03:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 47c802379ed53f524da796b43ed3d07c SHA-1: ff58ce2290bf68fb64205adcced2e1ebb84cbe5c SHA-256: 4f99f1468c7021c5dc7b22efb3c7fa8214f37ce89064e64ab2f9d9ce1c108115
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://jottigo.ru/award?keyword=richard+nixon+the+movie PDF link annotation
    • http://rafuzigukogare.22web.org/samsung_m2835dw_toner_singapore.pdfIn PDF document text
    • http://xupevagadozojad.22web.org/40219847689.pdfIn PDF document text
    • https://bufasijo.weebly.com/uploads/1/3/2/7/132740378/levariwanufen-keginivawoti.pdfIn PDF document text
    • http://dajivosi.22web.org/az-_103_exam_study_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387573/normal_60065afc8e446.pdfIn PDF document text
    • https://zabavorurexezab.weebly.com/uploads/1/3/5/3/135314693/3010988.pdfIn PDF document text
    • http://zexezolevonim.iblogger.org/which_element_has_2_energy_levels_and_4_valence_electrons.pdfIn PDF document text
    • https://natulawud.weebly.com/uploads/1/3/4/3/134309077/951216adfaf09.pdfIn PDF document text
    • http://daparewipubuzes.22web.org/google_chrome_for_android_5._0_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465136/normal_5fcc08239c627.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/jezekemunidup/53827325514.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/magic_eraser_sheets_material.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/potaj.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/dialogue_worksheets_middle_school.pdfIn PDF document text
    • http://gafomawonerif.rf.gd/wuzowukanutasugago.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_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 5104 bytes
SHA-256: ec3d1d9cbe4e9feaa5a904e0eadeb74b4f91261139d06a152a06b1d971c5ea54
font_01_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 10240 bytes
SHA-256: e64425a6ce97d3a0c3fe19717ffef15c83bf44fa99a6850641ee901866687697