Malicious PDF — malware analysis report

Static analysis result for SHA-256 e673386e593f8b67…

MALICIOUS

PDF

68.8 KB Created: 2021-06-05 01:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e2c3739eea29d65d7878be6768da632d SHA-1: 51d8975d429858cf6b0788dd0052297f54b73221 SHA-256: e673386e593f8b670f4626bf584b0ab38559e944cd0f8133186e1e4d7083236b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs are likely used to redirect users to phishing or malware distribution sites.

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://pelibifir.ru/123?utm_term=best+games+for+pc+2019+free PDF link annotation
    • https://vegipojefatelon.weebly.com/uploads/1/3/4/8/134876486/bf678df0dcc426.pdfIn PDF document text
    • https://nuvugokub.weebly.com/uploads/1/3/4/0/134016684/1780481.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuzimotum.pbworks.com/w/file/fetch/144551226/89575749499.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c73dccf-d69a-4013-8593-62161f88ffc9/kadazugirudeteme.pdfIn PDF document text
    • http://gonumutat.pbworks.com/f/cod_mobile_system_requirements_android.pdfIn PDF document text
    • http://dejulagimu.pbworks.com/w/file/fetch/144533022/free_esl_worksheets_for_beginner_adults.pdfIn PDF document text
    • http://giribuv.pbworks.com/f/dsl_light_not_on_nbn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e452ba-a66e-41e0-9830-f0c3d92e75ec/moultrie_m880_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78cab322-e33c-443a-b261-1f1bada100a6/27309980780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/639c73c7-2441-4296-9ef3-61ceb39c67de/what_do_you_mean_by_pecha_kucha.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144560766/how_to_use_a_topsy_turvy_tomato_planter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd92e8f8-ba9f-4676-a15e-153c92aaf870/80899532709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ce0141-1efc-42da-9db8-c49831f24f5a/milidot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64291caf-e015-4ca5-9dbb-e26fd36f46ed/68528472366.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/movezezabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a4187d2-63d1-481d-a238-23e00267e03f/best_forex_trading_strategies_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb576668-51ad-431e-87d6-47f4d2c8d31f/sec_rule_12b_1_fees.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9d292f0-56f3-44a7-a089-3c7b05ad99bb/best_way_to_do_a_process_flowchart.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144569541/diary_of_a_wimpy_kid_2_full_movie_watch_online_free.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/f/perfumes_the_a-z_guide_2018.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_off0000ce96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE96 5836 bytes
SHA-256: f7dd7f093ffb72ad638443102359fd8058c5b44634983057438fa33bb9ec8879
font_01_sfnt_off0000e26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26A 10328 bytes
SHA-256: 756268602024a35d5e43e488b00bcee37128298754f6a7811d9a96177addfef0