Malicious PDF — malware analysis report

Static analysis result for SHA-256 4821f2d139acf9d7…

MALICIOUS

PDF

68.5 KB Created: 2021-02-14 15:22:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 8da2d40a3668d928d43532cb43f5512d SHA-1: f1b7c3c7c8bc675eb528ff9245cb21abf68de65b SHA-256: 4821f2d139acf9d7d02566c92776b8356c969d91a58ffa45e8072fb5f291b46f
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://bologen.ru/wix?keyword=mis+final+exam+answers PDF link annotation
    • http://mujuwowewo.22web.org/rorime.pdfIn PDF document text
    • https://galekogikelubem.weebly.com/uploads/1/3/1/4/131438025/1676223.pdfIn PDF document text
    • http://pusolaxunu.66ghz.com/4108058929.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413375/normal_5ffae105cf9fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gofosuxubajo.epizy.com/actian_psql_v13_client.pdfIn PDF document text
    • http://dopozidimosopa.rf.gd/facebook_messenger_apk_por_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/android_version_huawei_p8_lite.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/mapa_asia_politico_mudo.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/fuvexeveteka.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/osrs_fletching_guide_darts.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/acronyms_quiz_and_answers.pdfIn PDF document text
    • http://romevakamijoke.epizy.com/school_admin_software_free.pdfIn PDF document text
    • http://kesekerezox.epizy.com/fitbit_charge_3_manuale_italiano.pdfIn PDF document text
    • http://pixuxurarosu.epizy.com/1643329418.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/nobupako.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/converting_decimals_to_fractions_sheet.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_off0000ceb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB9 5080 bytes
SHA-256: a67c65c6eb316d23e0e8c684c03367a722fbabf82a430fafd519d791b21da39a
font_01_sfnt_off0000e00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00B 10896 bytes
SHA-256: eda49ccd5c37ef2723ae64e6248146acf94ac4d3738ef7d46fde2e8f36e78f03