Malicious PDF — malware analysis report

Static analysis result for SHA-256 2307eb46b2f851c4…

MALICIOUS

PDF

78.1 KB Created: 2021-04-24 02:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40911061719a32fb8184d64551c25b1d SHA-1: 280b8dcbb75c4fbd2ea6f58aaca953abc109c6a4 SHA-256: 2307eb46b2f851c4c5fd212b735cafeef6a9db364832de315c72ade0b01406a9
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection scheme to deliver a malicious payload. The document body, though partially corrupted, suggests a lure related to generator maintenance, which is a common tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/strik?utm_term=how+to+change+oil+on+a+honda+eu2000i
    • http://vasakuso.sportsontheweb.net/future_english_for_results_3_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4416669/normal_6012ea2ad329a.pdf
    • http://warokibujiz.getenjoyment.net/cfm_calculation_formula_in_hvac.pdf
    • http://rajukilodagoje.mygamesonline.org/82977671257.pdf
    • http://rixorevu.getenjoyment.net/teletosa.pdf
    • http://jonotijero.medianewsonline.com/sownik_prawniczy_angielski.pdf
    • http://xiruzox.mygamesonline.org/cruse_1986_lexical_semantics.pdf
    • http://mezajozugabaso.getenjoyment.net/8849632132.pdf
    • https://cdn-cms.f-static.net/uploads/4391620/normal_6044245a50b17.pdf
    • https://cdn-cms.f-static.net/uploads/4403807/normal_600f232968f2f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mujelagikajuju.rf.gd/bmat_2016_section_3_answers.pdf
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_effc98acf80b4871ad65b086e2dc9ff6.pdf?index=true
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_66312c2bd71246d6ab31a839c56afd73.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b627d055-11bd-44cb-8d8d-e69b20c8373f/19868250213.pdf
    • http://ditivetigidu.rf.gd/inductive_and_deductive_reasoning_geometry_worksheet_with_answers.pdf
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_51fd102f89494724b8edfb62267e2547.pdf?index=true
    • http://wiferowifi.rf.gd/minecraft_wii_u_release_date.pdf
    • https://uploads.strikinglycdn.com/files/a9ff0fd5-40eb-4b1b-b6d6-431227871631/geraren.pdf
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_b389a65b80db481db9fee0c90de1eb69.pdf?index=true
    • http://kidajovude.epizy.com/techos_verdes.pdf
    • https://uploads.strikinglycdn.com/files/965c7314-ab4d-4774-935c-c9db9d84fa94/how_do_you_fill_a_blank_check.pdf
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_2e1f8d0d0794488bbf01736726091e7c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c6b1fb2d-4526-4520-a8c4-ccb20b6555d4/55718962164.pdf
    • http://lapesuzimu.epizy.com/five_dysfunctions_of_a_team_interview_questions.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4cd.bin
cf8a085ae49c5f2cf9a346ae0d9aca5e43b2cab4eb9929008cb1562988c59685		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CD 5252 bytes
font_01_sfnt_off000106bc.bin
acf142b2beb836f71724ccba725b08686af8a6747e2b0b9588c6c67508d9841a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 10424 bytes

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