Malicious PDF — malware analysis report

Static analysis result for SHA-256 587be85849e1e5d3…

MALICIOUS

PDF

87.8 KB Created: 2021-04-14 14:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ec9b854cb915e80b8bf0edf094a1235d SHA-1: b50b31bb3109621922372cb125939b1696b99846 SHA-256: 587be85849e1e5d321fab2f12a589e24dfff099227adb8039d3fd377f40a4637
186 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jacksth.ru/strik?utm_term=ge+spacemaker+xl1800+replacement+bulb PDF link annotation
    • http://dowotezovemalo.mygamesonline.org/lotiso.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedajoze/J1Hkig3/58886533075.pdfIn PDF document text
    • http://vojemodipu.sportsontheweb.net/tipos_de_comunicacion_oral_dialogo.pdfIn PDF document text
    • https://cdn.sqhk.co/lelogivotosu/hyZheMw/free_tools_to_check_website_performance.pdfIn PDF document text
    • https://cdn.sqhk.co/jadojibam/h0ribm0/bowling_alley_near_me_nj.pdfIn PDF document text
    • http://ecoterritory.store/23659587460la2jk.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/dzmbhia/color_quest_matching_gameboy.pdfIn PDF document text
    • http://fituxem.sportsontheweb.net/gutepoxe.pdfIn PDF document text
    • http://tugrull.com/83803225880cpnk0.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/gdQQ3jg/vixilugejajazojugikepaneg.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/pedawivulopadas.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/what_can_i_do_with_a_degree_in_public_relations.pdfIn PDF document text
    • https://cdn.sqhk.co/puxitika/bX61ifD/dish_anywhere_account_login.pdfIn PDF document text
    • http://ali5a1.worldwells.pw/go.php?t=32411730442In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_f0d391a8f3a4424993842a2285172b32.pdf?index=trueIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_a8f51a1730a843dea3decab7b731915a.pdf?index=trueIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_fd055f2b983048489da5b72050ef80cc.pdf?index=trueIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_ca270b20c620465398214b5e172a13de.pdf?index=trueIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_65bd9f2e918c4378bd6ec32589d789b6.pdf?index=trueIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_eba6daedcd794725a4b433412184501e.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3E 2996 bytes
SHA-256: 91c65d4daef29bab276e56b606f9c5013e4f13bc29c78e9eee33dd87ab02342c
font_01_sfnt_off00011702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11702 5768 bytes
SHA-256: 39b2408b53e7de4954290900117698fdd460360702280fdb88d3c470fada851f
font_02_sfnt_off00012a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A96 11424 bytes
SHA-256: 0794a8d36e4505081045c15ec8374fa6eb944e395b2815b130fbf6ae3974f541

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