Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f696046ef9f667…

MALICIOUS

PDF

80.2 KB Created: 2021-03-30 16:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 42ff620ba9745e02438821fad673a768 SHA-1: 55fbf81c4bae89b89d159fe782be23c973f15b30 SHA-256: d9f696046ef9f667853b5753723759f3f48afe02425c003a0492f7e6a9f91dae
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users. The primary URL, https://gimoguvi.ru/award?keyword=advanced+trauma+life+support+mcq+pdf, is flagged as a lure for free downloads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

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://gimoguvi.ru/award?keyword=advanced+trauma+life+support+mcq+pdf PDF link annotation
    • http://telovajov.medianewsonline.com/rixojagiz.pdfIn PDF document text
    • https://wudegilunukoga.weebly.com/uploads/1/3/1/3/131379548/3811895.pdfIn PDF document text
    • https://gozaxuvo.weebly.com/uploads/1/3/4/6/134612917/sozojinu.pdfIn PDF document text
    • http://saganofodevuset.22web.org/zovaromojuzifajunitep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noratev.myartsonline.com/87570532847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05996940-4716-4af2-ba4b-0d733bf8788a/46002859922.pdfIn PDF document text
    • http://nibizuladode.onlinewebshop.net/kimotumunen.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/free_genealogy_tree_template.pdfIn PDF document text
    • http://lejemerane.epizy.com/dubbed_horror_movies_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/how_to_setup_emerson_wireless_thermostat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bee131d-6e2b-40c5-8afb-0f41fa53c237/ms_310_stihl_specs.pdfIn PDF document text
    • http://kugogawi.rf.gd/fewarojewababepegodevada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/effbe83e-ac3f-40ee-9c08-6d2a7e17566c/jiputesajejasozinuv.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/hempathane_topcoat_55210_technical_data_sheet.pdfIn PDF document text
    • http://nozanela.epizy.com/drug_book_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/bupopalar.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/osmosis_and_diffusion_egg_lab_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/89656892537.pdfIn PDF document text
    • http://ebookisme.duckdns.org/atls_mcq_question_bank.pdfPageIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C9 5476 bytes
SHA-256: 7ae92550e577386c0ef366ab8197d6937f39b13ca1d45b340ca1b133c995cd1b
font_01_sfnt_off0000f95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 10804 bytes
SHA-256: 10dfc4a76b8b044d9d340d6d9863b6d581322ffefe04e73de00f4012a0666a92
font_02_sfnt_off00011e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E45 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15