Malicious PDF — malware analysis report

Static analysis result for SHA-256 43869c0c1a3f746d…

MALICIOUS

PDF

85.8 KB Created: 2021-03-24 13:35:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a0135bf6c2ab8346d90ebdd1b7ed3b4e SHA-1: 50aceb1cf8cbde7f6906a461f290b1a912f9188c SHA-256: 43869c0c1a3f746d480ce270ae47cc3b087b99247c08dd7e5f2739028b608f2e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=algerian+newspapers+pdf PDF link annotation
    • http://tuwukadinem.mygamesonline.org/barcelona_metro_map_2020.pdfIn PDF document text
    • http://nusezuretoti.scienceontheweb.net/orgrimmar_riding_trainer_wotlk.pdfIn PDF document text
    • http://omynutural.space/how_to_tell_you_have_a_bad_o2_sensorb92pa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407064/normal_60464c2421570.pdfIn PDF document text
    • http://idealica-columbia.site/28024180163cd9aa.pdfIn PDF document text
    • http://titoto.xyz/how_to_shift_a_8_speed_eaton_fuller_transmissionuho4z.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/magnum_inverter_fault_codes.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/harga_cartridge_printer_hp_laserjet_p1006.pdfIn PDF document text
    • http://jobauthor.online/mebevabobt6wj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416930/normal_602abeecc341a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vukujidor/how_to_change_vivint_thermostat.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_ae3981b47fcd44b38c293be6872ad345.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/56715391384.pdfIn PDF document text
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_f87de048ef794bb6bfb06017083e29e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazomo/faragopuv.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_dd01407602d649b28343291c622b14f5.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_97d4482dfafc49f0974c255184681235.pdf?index=trueIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_44390d9be5214f34a8cd219daa3d1d73.pdf?index=trueIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_083284fe02094b3caaa24d614e847a01.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feseni/fugarutimiwupisumudosa.pdfIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_fa94b774e3a54730b3e9b90de71b5dc4.pdf?index=trueIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_a37e62481e7e40f3885ae267280e3de2.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011a50.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11A50 25800 bytes
SHA-256: 951fb1acde8a64e80bfd83402068c1f6b1c4113ed7cb5226eb86f75be3b74bab
font_00_sfnt_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 5288 bytes
SHA-256: 45b679abb01a13a2a5f6cd90ca960c341935558d1325860f77cebad1f5925eb4
font_01_sfnt_off0000f563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 10832 bytes
SHA-256: bf698e89ed3a56f513b7f91674d116a2717aae7059e1e968929bcba9ef43f1fe