Malicious PDF — malware analysis report

Static analysis result for SHA-256 be54c17fe7e36f1d…

MALICIOUS

PDF

80.0 KB Created: 2021-06-08 21:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: be2bcc3bd0761d40825b7e9f01771192 SHA-1: 52269b4a7ce463983ca0d728957cf5d1a67e62d6 SHA-256: be54c17fe7e36f1d4d00b88ba290a06497051f7b8cc5060b187fd0f9ba64632b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It contains an embedded URI pointing to 'catamma.ru', which is likely a phishing or scam domain. The document body, though heavily obfuscated, suggests a lure related to 'Ielts cookery classes answers', aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://catamma.ru/pbw?utm_term=ielts+cookery+classes+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449992/normal_602b087ec5a78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_60489f0a4e82e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374178/normal_5fe3e5c6d4d3a.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/83f92abb-9113-40a9-81dc-5124540ae281/how_do_i_contact_canada_customs_about_my_package.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/w/file/fetch/144615132/sunamoveluval.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/w/file/fetch/144561795/gezijole.pdfIn PDF document text
    • http://ropotupi.pbworks.com/f/driving_license_test_questions.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/f/vazigi.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/w/file/fetch/144433029/riwidiweredatewaji.pdfIn PDF document text
    • http://wejojixi.pbworks.com/f/passive_voice_past_continuous_tense_exercises.pdfIn PDF document text
    • http://jukozatixul.pbworks.com/f/sociology_optional_notes_in_hindi_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc7cc543-7a28-4c5f-9bca-2accff2ae0d9/93289792248.pdfIn PDF document text
    • http://xobapotowi.pbworks.com/w/file/fetch/144572877/what_kind_of_virus_causes_hives.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/f/auditoria_interna_iso_9001_verso_2015_checklist.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/w/file/fetch/144572154/how_to_make_rental_income_spreadsheet.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144583377/ads_sensitivity_rainbow_six_siege_console.pdfIn PDF document text
    • http://supijexed.pbworks.com/f/79092049339.pdfIn PDF document text
    • http://pejokawigar.pbworks.com/w/file/fetch/144864858/bomfunk_mcs_-_crack_it_something_going_on_lyrics.pdfIn PDF document text
    • http://bojirakaj.pbworks.com/w/file/fetch/144751458/zisalovowebidizawutuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39abdc94-1fb1-4ddc-b839-0a539cb521d2/xiresufitufamivifewusar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b46b630e-5a38-4895-a137-4c0c49fc0feb/how_often_do_you_have_to_add_wood_chips_to_a_masterbuilt_electric_smoker.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/kevipazalutemulotepetad.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_off0000fb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 4988 bytes
SHA-256: 9e8a2c1a2c4459bb5908610c2638bada11856a8fae62838b3093412831a359c4
font_01_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 10912 bytes
SHA-256: 9eed4db3f2fce6d8b24bce3feb7b725ef521184356bc3fbbe04acce3784db414