Malicious PDF — malware analysis report

Static analysis result for SHA-256 22481cb3edf9c1f6…

MALICIOUS

PDF

77.8 KB Created: 2021-03-29 21:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 10e44fba1794e034de8fc2fbea8c487c SHA-1: 988595e34299b97b3842a772b5d62ce714e5a964 SHA-256: 22481cb3edf9c1f6aba4dfc27280b0281807d74f7a46d55915a37a41e9ad3f74
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 0.9991

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://jottigo.ru/award?keyword=ejercicios+de+analogias+verbales+resueltos+pdf PDF link annotation
    • http://gikepofazanapol.mypressonline.com/entrenamiento_aerobico_y_anaerobico.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/gjehbie/blue_apron_stock_symbol.pdfIn PDF document text
    • http://namsinc.info/4216181367079d5i.pdfIn PDF document text
    • http://rapoxarawiwalo.sportsontheweb.net/anchoring_script_for_school_annual_day.pdfIn PDF document text
    • https://cdn.sqhk.co/divekezor/iafvfha/tawadanerosivoda.pdfIn PDF document text
    • http://alphabitx.com/the_abcs_of_violin_for_the_absolute5645m.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/47385501840.pdfIn PDF document text
    • http://wowitaly.pro/21445327623peu2d.pdfIn PDF document text
    • http://podeves.xyz/unacademy_learning_app_downloadt4pih.pdfIn PDF document text
    • http://card2card.live/grade_1_reading_comprehension_freernili.pdfIn PDF document text
    • http://legendarycraft.ru/darkin_kayn_guidebs7je.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/angular_2_form_validation_example_plunker62x06.pdfIn PDF document text
    • http://rostov-mobile-doctor.ru/8406688330138fy6.pdfIn PDF document text
    • https://cdn.sqhk.co/legezuseg/df0LM1i/rollerball_massager_for_back.pdfIn PDF document text
    • http://zovofuti.mygamesonline.org/cfa_level_1_ebook_download.pdfIn PDF document text
    • http://marketeuro.pro/jurixulumorudol63e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_70139cce854140e29dbaf4a6408b0089.pdf?index=trueIn PDF document text
    • http://namakanexir.atwebpages.com/imagenes_de_caritas_tristes_para_whatsapp.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/wudibose.pdfIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_5b9345ff0abf494e86fe161e4a2ba004.pdf?index=trueIn PDF document text
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_938b59a9dbdc49b0b1606368dd18c90e.pdf?index=trueIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_c16aa7cb2f4f4db381a5e744ed524754.pdf?index=trueIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_05eec515214e4ed39bc46f1b27893839.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/83806366355.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_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 5556 bytes
SHA-256: b95f94091110bdccfa1527d785e69b0b032670d463fd983b17d45aa375024209
font_01_sfnt_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 11892 bytes
SHA-256: d229a9762a3b02b0fa086ee5ccb8a4ad66f86c2dc4f322015aaa56832ba70029

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