Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5e4a8df1bb8f55…

MALICIOUS

PDF

73.4 KB Created: 2021-03-14 22:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8472863e12031730e7375c0dd67576a2 SHA-1: d3c784222b12c53baefc1c379baad919f0684d57 SHA-256: ee5e4a8df1bb8f55cf4bb51fe42dc3d4fa5a9d26d3cc2161f5f9508970b12886
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest an attempt to exploit users through deceptive links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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 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://xajibur.ru/award?keyword=cirrosis+hepatica+alcoholica+nutricional+pdf PDF link annotation
    • http://julivojurukumu.sportsontheweb.net/what_is_diverse_learning_programme.pdfIn PDF document text
    • http://vobajujabu.mywebcommunity.org/fixesepa.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/633840779573jvxl.pdfIn PDF document text
    • http://atlas-copco.su/tohatsu_5hp_outboard_manualuxben.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/why_does_my_water_softener_taste_like_salt.pdfIn PDF document text
    • http://in-arenas.com/chemical_analysis_report_template0ya1n.pdfIn PDF document text
    • http://vk-settings-change.online/sobowumovizakawiziterikillnb5.pdfIn PDF document text
    • http://muzibatixabu.mypressonline.com/modals_must_examples.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc5d8a93-3fa3-42d5-9ddf-fc54d0520bfd/742531707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/286a7bd6-e9c0-4f07-8366-a5332f59c6b6/31098459530.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/intermatic_outdoor_timer_hb51rc.pdfIn PDF document text
    • http://wawutanow.epizy.com/77793307331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d91d0b0f-acfb-4458-843f-c7ccbe2ee91f/40878760163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e507c97e-0a98-460a-9af1-ec210191c97a/wegeve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35da9178-0fa9-41de-bdd7-791f46db8f4d/ideas_for_narrow_side_gardens.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1327b131-2ec5-414a-a1ac-00e9ce684a91/easy_piano_music_free_printable.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/is_obamacare_better_than_trumpcare.pdfIn PDF document text
    • http://nununad.myartsonline.com/caracteristicas_del_clasicismo_literario.pdfIn PDF document text
    • http://pofijiserige.onlinewebshop.net/mandera_county_bursary_form_2020.pdfIn PDF document text
    • http://poxemibusap.epizy.com/morfologi_bivalvia.pdfIn 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_off0000e9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 5148 bytes
SHA-256: cb41333e5d03484b9e41be552eab17ca920cd00fd767f9fc66986d268213392c
font_01_sfnt_off0000fb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6A 11452 bytes
SHA-256: c2805358eebc4cb6a7d5eb0a55b87ff3ea98edfc42bf541072fafe27b5b4f81e

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