Malicious PDF — malware analysis report

Static analysis result for SHA-256 4663e5eaaa765ec3…

MALICIOUS

PDF

75.1 KB Created: 2021-03-10 18:03:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 19297bc4a0a7fe435a356cf7880cfc8c SHA-1: 55fcd66e0454e24e7205e2375a08810dddf391f3 SHA-256: 4663e5eaaa765ec32669e429f258260b4b452514e8cce014c12b2e1e3e40fb41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious websites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://xajibur.ru/award?keyword=calendar+year+2020+pdf PDF link annotation
    • http://help-lnstagramcopyrights-verify.com/64706462239shiu5.pdfIn PDF document text
    • http://vashmaster.info/bruchrechnen_arbeitsbltter_5_klasseuwyik.pdfIn PDF document text
    • http://beautysss.site/free_printable_face_mask_required_sign_in_spanish470yc.pdfIn PDF document text
    • https://cdn.sqhk.co/kovezozeseg/9idTphd/4119962630.pdfIn PDF document text
    • https://cdn.sqhk.co/xumefotebe/VOgdjcT/marvel_future_fight_characters_list.pdfIn PDF document text
    • http://nusowutevu.getenjoyment.net/42502516827.pdfIn PDF document text
    • http://ukrdomonis.xyz/planet_fitness_tredegar_contact_numbera8hb8.pdfIn PDF document text
    • http://apsdd54gfv.xyz/jane_jacobsen_facebookgh5dh.pdfIn PDF document text
    • https://cdn.sqhk.co/xarobumevux/gc0hhdn/27242188101.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/keurig_model_b40_filter_replacement.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/spanish_dictionary_book_online.pdfIn PDF document text
    • http://fibipowokogo.sportsontheweb.net/bancassurance_regulations_2020.pdfIn PDF document text
    • http://prizinsta.site/dojuseramuribfun.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/64750649260.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/kung_fu_hustle_english_dub_free_streaming61jzy.pdfIn PDF document text
    • http://rubisteq.online/whirlpool_repair_numberskvh1.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/26329393944.pdfIn PDF document text
    • http://meetchat.space/bonunuxoparuxaxo9vj9v.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/gfIiciL/fogorobakofuwi.pdfIn PDF document text
    • http://kinoxca.xyz/a_world_of_art_5th_editionbmpa5.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
    • http://sekuwomexapa.myartsonline.com/hobart_meat_slicer_model_1612.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/644628708.pdfIn PDF document text
    • http://gakilasefit.myartsonline.com/giwozedonimejarexisunu.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/how_to_play_ukulele_a_complete_guide_for_beginners.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_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 4808 bytes
SHA-256: 18efcf0449ab2572b3753b6fa230debb24d035ce2c33e41c7099e9f04bec736d
font_01_sfnt_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 10160 bytes
SHA-256: a5114779e9665262c67983d25dec6870b5ce3903509355efbb50e1a6449a3a3b
font_02_sfnt_off0001109c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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