Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15b41c5ca99da82…

MALICIOUS

PDF

79.3 KB Created: 2021-03-11 15:57:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 867b991cef0abd9ec216fcf84f0407b1 SHA-1: 17bfb18e3e12b7dd66c534381c41295cff2cc6a6 SHA-256: a15b41c5ca99da8286b5a831ece7fab02accffb963575704a02d16dd75d73cf0
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 0.9990

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://pelibifir.ru/award?keyword=bill+of+rights+worksheet+pdf PDF link annotation
    • http://nosatines.mypressonline.com/100_ways_to_avoid_using_the_word_very_english_vocabulary.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/xDjjih8/gerasibusawopuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453344/normal_6049b0a612e00.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/1480769285.pdfIn PDF document text
    • http://lokotahas.ru/ruwenobatifumanugupigixovfq310.pdfIn PDF document text
    • https://cdn.sqhk.co/puvijupem/kjhgcjg/cross_road_blues_supernatural.pdfIn PDF document text
    • http://ripugusulufiluj.getenjoyment.net/how_does_a_magnetic_field_affect_a_moving_charge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443617/normal_5fdb7245b3c68.pdfIn PDF document text
    • http://gisoboxizaza.mygamesonline.org/data_structures_and_algorithm_analysis_in_java_3rd_edition.pdfIn PDF document text
    • http://wbigs.space/oblivion_song_cbrvvny2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370768/normal_60406cbc4bcca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454419/normal_602eff95ba088.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejagefep/5G0HJry/raid_shadow_legends_ad_copy_and_paste.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/dxijjjs/free_hearts_card_game_download_for_windows_7.pdfIn PDF document text
    • http://vezdesami.ru/fichas_de_numeros_del_1_al_10_para_imprimir_enww3o3.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxeromewime/dyRxtKW/54850588642.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ae2d719a-7c24-4750-9341-ab263ecf2b0d/71160698569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63e3732f-290e-4579-9afe-e25486265949/the_lion_the_witch_and_the_wardrobe_book_plot_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f66ae3f-36be-4a74-82ad-f254f590e8cb/military_hand_signals_meme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/515ebab7-1d10-44f8-b38b-1ef7ee7da257/do_cashiers_get_drug_tested.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51bab357-340c-49e4-ac97-f72d57b3d72f/what_is_the_first_letter_in_arabic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc121ba1-378c-4517-890d-01f13cf5ef3a/45539892291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a060ccc-7ae1-4ea4-bfef-18e2de8c5c3c/weluguxuzepenoturalo.pdfIn PDF document text
    • http://bojepudadadax.atwebpages.com/ayat_kursi_dan_artinya.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 4980 bytes
SHA-256: 4d16247cdd71643483939cb034bddaadd7f529605b086c682126f4d18f81f640
font_01_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 10196 bytes
SHA-256: 82fb0dd10d8787f1cee79afba6ac501b7df862db66314249a6787b8cfe6d8640
font_02_sfnt_off00012150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12150 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361