Malicious PDF — malware analysis report

Static analysis result for SHA-256 523ca2be0ae2fce8…

MALICIOUS

PDF

72.7 KB Created: 2021-03-11 08:10:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 26507613ef593301cea9316f9a492827 SHA-1: de60c5319b9ba7c38bf3583590f9c293ad7c0c66 SHA-256: 523ca2be0ae2fce8814267525026b1889c76bc82efe90ae109c3d77decd423d1
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 0.9998

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://soxebez.ru/123?utm_term=video+song+gaana PDF link annotation
    • https://cdn.sqhk.co/kilatelazobe/z2ijmQJ/rogue_legacy_xbox_one_achievements.pdfIn PDF document text
    • https://povizizumor.weebly.com/uploads/1/3/4/6/134636509/1466846.pdfIn PDF document text
    • https://cdn.sqhk.co/fegibowaxus/75wiiic/neha_kakkar_new_song_ringtone_download_2019.pdfIn PDF document text
    • https://vizumijolotetip.weebly.com/uploads/1/3/5/3/135394273/pigowabijam.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/7085031.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/Mib1nhg/star_wars_resistance_characters_list.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/ejinVjg/biluro.pdfIn PDF document text
    • https://nefirekemoziwep.weebly.com/uploads/1/3/4/3/134332842/8d89e.pdfIn PDF document text
    • http://raisinsapp.pro/ham_radio_technician_license_sample_questionss3oac.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/jfjg0hh/offline_shooting_games_for_pc_low_spec.pdfIn PDF document text
    • http://siankaanmexico.com/what_is_a_word_that_starts_with_oe1y5m7.pdfIn PDF document text
    • https://kobetuditi.weebly.com/uploads/1/3/4/4/134446504/guzotokibudata.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/tggghjh/57910187573.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/waduzirader/guidestar_bronze_seal_of_transparency.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/rodovaxiribifikogo.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_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 4832 bytes
SHA-256: f6998a4f4acd5fe210de98b0a8301fb294546965c63da58b78dfb1e1e1e8c7d3
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 11376 bytes
SHA-256: bb39327ee20e6e3de3a5e50114ddf634e2ba4207ae78b5a3497a569c811af639

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