Malicious PDF — malware analysis report

Static analysis result for SHA-256 724b9d6085723315…

MALICIOUS

PDF

90.0 KB Created: 2021-05-01 02:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5b0ce12bb1b089c359b05ff754aae449 SHA-1: 27c8a40a3e23e3dc832510e52f8ded806d3ae987 SHA-256: 724b9d6085723315b092790d9d57fdce9362cbdfeef09126cb6d490c2773c80f
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm strategy, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall structure strongly suggest this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=can+lg+washer+and+dryer+be+stacked PDF link annotation
    • http://sakulog.sportsontheweb.net/pathfinder_monster_feats.pdfIn PDF document text
    • http://refazali.mygamesonline.org/apache_http_server_version_2._2_documentation.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/hhgijWV/bajirimizokegenikaloxew.pdfIn PDF document text
    • https://cdn.sqhk.co/texekikevow/Qiaicic/80996290888.pdfIn PDF document text
    • https://cdn.sqhk.co/pakebisas/jfSRUUl/word_jumble_game_python.pdfIn PDF document text
    • http://ins.expert/piggy_cut_rope_gamezuykp.pdfIn PDF document text
    • http://stroy-level.ru/canada_visa_application_form_mumbaijaxb7.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/dXE4ja2/254027318.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/bbc_compacta_class_11_english_answers.pdfIn PDF document text
    • http://top-salez.site/whats_a_good_lg_sound_bar8c5fk.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/bossard_catalogue.pdfIn PDF document text
    • http://drilltech.info/lipuvelilavklsv7.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/9d85d8cf-00d2-480c-9f2e-10527f23a7ae/zidumikadinazajugifuparu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b39b1d-5326-4904-9758-06ebf6be41d5/curso_de_ingles_online_gratis_reconhecido_pelo_mec.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be7a5f66-b07a-4501-8891-07fb7d8afe88/mhw_arena_quest_8_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7233e9b0-6655-45d0-b841-378c27968384/36785799597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ca9f2f-fcd5-442d-b435-4ca8857f88f5/kane_chronicles_netflix_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c17b949a-4cb5-4af8-8850-53948e869b4c/kokotilaveziwirulowiwani.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_off000122ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CE 5504 bytes
SHA-256: 279f3709318dc287e89e98241ab8f30dd7702a14178c02f41ccae01bf8b0c9f0
font_01_sfnt_off00013590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13590 10996 bytes
SHA-256: e0746041d62e769eba245214b948912bdc43e25929f59cf7d468c4ddaf113c2e

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