Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a23adfebb015c8…

MALICIOUS

PDF

72.8 KB Created: 2021-03-03 16:37:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: ac5f40f2d4f0845cafe7a5322b860275 SHA-1: 7084cac7525e23210cd6533392421d7c69d7d2ae SHA-256: f9a23adfebb015c82ae2f2f9e42b08477658bfd546a5d5a760caa524ad1b1cda
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/wix?keyword=fitbit+manual+alta+hr PDF link annotation
    • https://bexobejunoguwed.weebly.com/uploads/1/3/0/7/130775871/3894420.pdfIn PDF document text
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/penog_mexim.pdfIn PDF document text
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/modobotat-podafikalisu-busuxib.pdfIn PDF document text
    • https://vufagejibuto.weebly.com/uploads/1/3/1/4/131483336/68dcb114f095.pdfIn PDF document text
    • https://rajidekexosixi.weebly.com/uploads/1/3/0/7/130738830/6b4bcbb3c086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_5fdb0e395f3a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_602071b589ad3.pdfIn PDF document text
    • http://nibakelenixezas.getenjoyment.net/655290547.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rulamiji.onlinewebshop.net/dream_interpretation_snakes_in_house.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/auto_blur_background_app.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/free_editable_calendar_template_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/8666894024.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/cdhs_mandated_reporter_training.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AE 4496 bytes
SHA-256: 4592aff9b1cfdbb0962c594e1cd433370e0d5e1a144ec7dcc78bbbc29ca19b85
font_01_sfnt_off0000e3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A1 11248 bytes
SHA-256: b5e92b3cd98cfaa4bcf452a82c4d4ff738a6c45ebf0ea22088ebccbbcda6c658
font_02_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333