Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d32a388b9c002ba…

MALICIOUS

PDF

78.0 KB Created: 2021-03-18 06:41:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 41b16254332fa0d06c89158ac623da57 SHA-1: f1b8061ee4ce8391043ba77cda0083dbf1df5de4 SHA-256: 6d32a388b9c002ba10790527d66e289180d3e0e10ad6d5944be4ce8474c5eb7a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a large farm of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body is heavily obfuscated and appears to be junk data, but the presence of 'Venta sonic vs205 manual' suggests a lure.

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://resalured.ru/wix?keyword=venta+sonic+vs205+manual PDF link annotation
    • http://sigixexizo.sportsontheweb.net/barium_meal_follow_through_technique.pdfIn PDF document text
    • https://cdn.sqhk.co/jabezoxujo/yPidvib/fulir.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/ia0mifW/university_of_montana_grizzlies_football_schedule_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujonad/iad0Lge/my_board_file_login_army.pdfIn PDF document text
    • https://cdn.sqhk.co/ramusozutage/IeieiaN/spanish_flamenco_guitar_sheet_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417675/normal_5ffb600dc6925.pdfIn PDF document text
    • http://virivuluk.getenjoyment.net/dumopukubatumitibaxime.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxazagugura/bQ9xYjc/human_fall_flat_crossplay_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425737/normal_5fcb11b14e252.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/17f6e13e-e122-4dad-b83c-fbf5710d607d/87446902597.pdfIn PDF document text
    • http://vobozezojip.onlinewebshop.net/jenn_air_range_parts_knobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56755d4a-56d7-4450-ba58-b137b10a02a6/drawing_line_graphs_lesson_tes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38b59be5-5ab5-425d-a632-c75aa7050cef/rofamakavebalawulirinir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d1e9e99-d9bc-48b9-b798-83cb19e7952b/the_natural_rate_of_unemployment_consists_of_only_quizlet.pdfIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_cc086e129aba470e82f6d1e5ce3ebd02.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a65e62a-1a15-4624-be87-bdb71d1c7c01/how_to_thank_your_boss_for_good_feedback.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8926831-8dc1-47a1-971b-b85baf166e45/the_game_movie_1997_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/402b2a4b-68d6-427f-9624-3ab77146e2cf/replace_image_unit_samsung_clx_3185.pdfIn PDF document text
    • https://d497f082-4895-42de-a72c-038d9367c8a3.filesusr.com/ugd/8e727b_0e8e356c91ac48cb92a5f667dd3d08da.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 5272 bytes
SHA-256: e5a15d0d00cfb59852b62272b6062e234f06fe432400fdf702938d4f8ed60452
font_01_sfnt_off00010284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10284 11848 bytes
SHA-256: 3214e80254c55df813dc844a70776c18225a92ae8e091f62aca21249b1a1ea6b