Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89435003d1af3df…

MALICIOUS

PDF

82.6 KB Created: 2021-03-15 17:45:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 15056bf2ff5c9dcc7814cc34dbb1a2be SHA-1: 2295beefc3041f2e642edb88a007399781fb6565 SHA-256: b89435003d1af3df2ac108af6cda33aa63a6bb210bfb21cbc1581f42e0ca6bd0
184 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains numerous embedded links, with one prominent URL leading to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to 'coloring sheets for preschool sunday school', suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=coloring+sheets+for+preschool+sunday+school In PDF document text
    • https://cdn.sqhk.co/diwamukef/iajbgih/tip_top_shoes_hours_nyc.pdfIn PDF document text
    • http://zomoxoxuriw.mypressonline.com/fanugexiwevejiburuzozu.pdfIn PDF document text
    • http://lorenbayi.com/79089653881peq3u.pdfIn PDF document text
    • http://rijigikesezaga.mypressonline.com/how_to_play_settlers_of_catan_cities_and_knights.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/jvNhcic/gazaterutirapap.pdfIn PDF document text
    • http://hocostyle.ru/55880166377qs1ys.pdfIn PDF document text
    • http://legegapepapo.medianewsonline.com/synthesis_of_silver_nanoparticles.pdfIn PDF document text
    • http://sunufosabupes.scienceontheweb.net/surabogimozunovevipomu.pdfIn PDF document text
    • http://streamsweets.com/83344468229urfom.pdfIn PDF document text
    • http://tixokapine.mypressonline.com/51818827307.pdfIn PDF document text
    • https://cdn.sqhk.co/texekikevow/jhjeigY/management_information_system_definition_and_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/B7ibCWw/monster_hunter_world_wiki_fatalis.pdfIn PDF document text
    • http://devgm.design/el_gran_grimorio_completo0v6mz.pdfIn PDF document text
    • http://vonoxafaku.scienceontheweb.net/adobe_reader_download_windows_xp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bidajalej.onlinewebshop.net/40596999851.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/back_to_me_daya.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb94cc8a-28d9-486d-8303-927726b0d59d/65024433861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/874c2371-1e90-403d-8e4f-d2b701ec3f8d/what_is_the_difference_between_the_iliad_and_the_odyssey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a14b2e42-d581-4715-91eb-f27e3fa55cf0/59794727257.pdfIn PDF document text
    • http://bidusibebawuz.onlinewebshop.net/microlife_blood_pressure_monitor_replacement_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/sepereviwezuker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96250b33-7464-4ead-8512-e297dd2ea46b/75238048805.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/66401230155.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/update_bios_gigabyte_p61a-_d3.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
    • 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_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 5424 bytes
SHA-256: d1fa82395bca152cfb91a440b5589bd2a952138b1272fba5b42f6f5a8e46e1b1
font_01_sfnt_off0001011a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 11336 bytes
SHA-256: b32b8b10e8fe343001fa492f720c0503caa88a770b6fa9132658d4558151a691
font_02_sfnt_off000127a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A6 16100 bytes
SHA-256: 2f34e2a47881d07bf5e0ddcec7fa78b88f5f828504524ebfdba63e029b22e37e