Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee179223feabd81…

MALICIOUS

PDF

75.2 KB Created: 2021-02-14 15:25:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 69d1bc3ce01ea724bc84f4254bb5f4b3 SHA-1: b408ea13e69f9633c054ad4874ea552699aeaad0 SHA-256: 7ee179223feabd81409c4f4cc77419ef066b7f8e7e80d9b42c84bf50f78e7abd
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. The ML classifier strongly suggests maliciousness, and the presence of numerous links to potentially untrusted domains supports this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=warm+ups+before+volleyball+game PDF link annotation
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/860860.pdfIn PDF document text
    • https://zisovubuzuteb.weebly.com/uploads/1/3/6/0/136086112/f44b76e91e377.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/kigjfhg/70861703969.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/bodumowego.pdfIn PDF document text
    • http://fozenumuwa.22web.org/31319557975.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/qCibHix/disneyland_florida_park_map_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/Q1kjfhc/ship_sim_2019_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/safovokon/IPtigia/wowawusasenufeji.pdfIn PDF document text
    • https://sasifebuwanozag.weebly.com/uploads/1/3/4/2/134234849/5392883.pdfIn PDF document text
    • http://xaxifibipebux.iblogger.org/duwapesi.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/buEY8if/mirin_fusion_kitchen.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/g2gfzic/uefa_champions_league_standings_today.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/pyigjjg/operations_management_certificate_durham_college.pdfIn PDF document text
    • http://vafakewa.iblogger.org/different_phases_of_biotransformation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jazupizewatabal.epizy.com/brachial_palsy.pdfIn PDF document text
    • http://pukafenofi.epizy.com/late_for_work_warning_letter_template.pdfIn PDF document text
    • http://pinamagowejut.epizy.com/92040685562.pdfIn PDF document text
    • http://podifugugak.epizy.com/84165208394.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_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 5536 bytes
SHA-256: fd54b02de3f7ba70c48a5a15622a85358b47dfbfe562b904b07740faa9c277f8
font_01_sfnt_off0000fa81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 10944 bytes
SHA-256: 80f06b5e10e2230545be13604bef8c41361905f0e48b83779cb241c084c84a73

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