Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4ec38ae892b2df…

MALICIOUS

PDF

79.9 KB Created: 2021-04-08 18:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1db4120172ccd178bb80effbf3a4d8a2 SHA-1: 3dbbe808a7df0df1bb2fa89d37f3b8289d77885e SHA-256: 7e4ec38ae892b2dfce0769c1fd2fb86cf367028055611fee87a282b77ea441eb
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://botokaw.ru/strik?utm_term=the+stand+stephen+king+miniseries+cast PDF link annotation
    • http://probnik1313.tech/55398504564b9jh0.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/fTnn4ja/real_bike_racing_game_y8.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/iIkgdhh/54983868947.pdfIn PDF document text
    • http://testertumentum.space/information_governance_interview_questions_and_answers9840l.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/mjbJrib/jimmy_john_s_pipin_hot_sandwiches_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/wolanojijen/drgjRFe/race_bikes_for_sale_nz.pdfIn PDF document text
    • https://cdn.sqhk.co/balatexoriv/njjTU1g/microsoft_smart_card_manager_download.pdfIn PDF document text
    • http://astrohelp.space/besplatno_skidanje_muzike_oazafx73m.pdfIn PDF document text
    • http://sale50.pro/lovogepemk89xp.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/al_quran_with_bangla_translation.pdfIn PDF document text
    • http://bitcoins-profits.com/taco_bell_sauce_nutritional_valuevyqru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_df2368079a93473fbb1050d44343f613.pdf?index=trueIn PDF document text
    • https://ff8eac81-0dee-4da4-b7c1-1dee070544a7.filesusr.com/ugd/2637cf_2705f720c7cf49a29b22d076a4014554.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/nudejabavemizuxirogutibe.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/someone_like_you_piano_cover_with_singing.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_895064b0e39b4f39827531be44b0aa04.pdf?index=trueIn PDF document text
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_b8d0be080ca948e4a601a59c6000929b.pdf?index=trueIn PDF document text
    • http://vepitejususas.atwebpages.com/ohio_air_practice_test_algebra_1.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_off0000f92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92C 5468 bytes
SHA-256: aa99ae817bd218ab5ae884247a4ad76d45d59bf6aa84f08d7efa9c4f3f9bb166
font_01_sfnt_off00010b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9D 11488 bytes
SHA-256: c2f6a7541e7da75f42456b684cc17f94b19567c8daa0c3e95b833252d31119c3

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