Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ddb173b6312872…

MALICIOUS

PDF

82.9 KB Created: 2021-02-21 22:01:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 329fc511ddf4a7f3595c79806ec87f53 SHA-1: 15ee18f28282babe2dc14c58eb5bcbbe5b1bfdc7 SHA-256: f4ddb173b6312872694c6a2cf73436ab0c674e617216864b7790a609ca91570c
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/123?utm_term=how+to+find+out+your+permit+number PDF link annotation
    • https://cdn.sqhk.co/rufebumu/ijLicja/87136422304.pdfIn PDF document text
    • https://fipamowusaki.weebly.com/uploads/1/3/4/8/134879766/9252777.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/Miche5o/descargar_piano_tiles_3_para_pc.pdfIn PDF document text
    • https://sadutixonigonu.weebly.com/uploads/1/3/1/4/131412491/1669278.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebegawiwa/nXXzeij/xonufuvubijofojunuribafek.pdfIn PDF document text
    • http://pochta-24.cc/224766335070aoir.pdfIn PDF document text
    • https://cdn.sqhk.co/jusitufugaf/b8Bhbz9/10894109346.pdfIn PDF document text
    • https://cdn.sqhk.co/fajaleniwa/erjiicX/idle_highway_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/puberufibo/ghhbhgJ/lyrical_dance_songs_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/X5gfjea/doom_patrol_trailer_song.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
    • https://s3.amazonaws.com/xijilesuzuxo/south_movie_new_filmywap.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/real_estate_appraisal_report_types.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/new_action_movies_2019_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/lagu_chinese_new_year_sales.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 4944 bytes
SHA-256: c628e3e59bf12a49bf41693f3f7a55ca191c37c38ada222454b8600ed86b38d6
font_01_sfnt_off00010ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB4 11012 bytes
SHA-256: 09278d8f028577e101b7e0277a8df8da72b161672b73d6810ba31d76facda4d2
font_02_sfnt_off0001306d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306D 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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