Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f06e4f859db8f0f…

MALICIOUS

PDF

84.1 KB Created: 2021-03-28 12:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3e60d3c0844f0bd3731936aab8da6b48 SHA-1: b318a7699a3eed52dbad72cab00ee862f75d1fa8 SHA-256: 7f06e4f859db8f0f662de95a88b0c06dd1050e64a2e77485aededc162fb47351
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure, likely to trick users into clicking on the malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=article+partitif+exercices+pdf In PDF document text
    • https://cdn.sqhk.co/butofelo/odVhgoP/sumo_logic_stock_ipo_date.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/cDgiuZf/car_racing_games_for_pc_free_download_softonic.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/kuDOUge/50558812862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392664/normal_60534c46cfc7e.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/qjkMhgC/desiwolag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459466/normal_603ff45941e10.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/tKgjZAN/ted_cruz_department_of_education.pdfIn PDF document text
    • https://cdn.sqhk.co/bazopaxepifu/RTGdnDz/rowasonupagiwolawiziruj.pdfIn PDF document text
    • http://takodevizol.iblogger.org/university_vocabulary_list.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirijobadi/hfig0PA/tubifarikedudijalupujo.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/53a1d8d6-e5d6-4af8-9f24-50010a19b585/life_fitness_x9i_elliptical_battery_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/kabasumaxopozol.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/jisagoveje.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/daxedugexolo.pdfIn PDF document text
    • http://joxowosikaze.rf.gd/current_affairs_2019_august_question_answer.pdfIn PDF document text
    • http://bitudisejopelak.rf.gd/lotabolokawi.pdfIn PDF document text
    • http://bexamunexena.rf.gd/54684293264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/289e7520-3532-44d2-a1c2-8cfbe31ddac5/run-on_sentences_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/dell_r710_server_2016_drivers.pdfIn PDF document text
    • http://vusukunuvedigup.epizy.com/allen_bradley_plc_programming_manual.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_off00010533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10533 5204 bytes
SHA-256: 006c8e5b0c0ba0d0952c9cf36dd480bfc9a80573d08a6f649e799cdf9388c243
font_01_sfnt_off00011702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11702 13756 bytes
SHA-256: 3ecdf587f103f3ebd6f26b66f5b44ae3408cf444c3e5d23583853be565447b93

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