Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1450c287cab48a…

MALICIOUS

PDF

85.8 KB Created: 2021-03-05 23:29:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cbb9f760d48d8792c80b04ce329d25c5 SHA-1: 4e1e5deebcbbbac79bec25e9fbedd5cabb82213a SHA-256: 5f1450c287cab48a3b35cf6ff21636799f57dfa805c20e2f0cff4c8bee2f9274
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and numerous external URIs point towards a malicious intent, possibly to redirect users to phishing sites or download further malware. The presence of 'wkhtmltopdf' in metadata might indicate the PDF was generated programmatically for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/strik?utm_term=jesus+from+genesis+to+revelation+don+moen PDF link annotation
    • http://vubitim.sportsontheweb.net/how_much_can_a_pallet_jack_lift.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/iY5vWgo/globe_load_paypal.pdfIn PDF document text
    • https://jajesawi.weebly.com/uploads/1/3/0/8/130813829/xafupimaguvigetaguxa.pdfIn PDF document text
    • https://ginegumogigoxi.weebly.com/uploads/1/3/2/8/132816185/vanujaforukowek.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/URXimjj/game_wheelie_challenge_ios.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/how_much_do_physical_therapists_make_monthly.pdfIn PDF document text
    • https://cdn.sqhk.co/junikesiza/IEfgdJZ/38044561171.pdfIn PDF document text
    • http://bamirajewenexo.medianewsonline.com/veg_recipes_for_dinner.pdfIn PDF document text
    • https://cdn.sqhk.co/tusufawenu/eNgc5ig/uniwars_black_italic_font_free_download.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/54676973925.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/vSgg30S/cooking_adventure_next_update.pdfIn PDF document text
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/juwufasanozu-xufaf.pdfIn PDF document text
    • https://cdn.sqhk.co/patagarinixa/hgE5jiS/ants_go_marching_song_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/aXUgRii/todo_listo_means.pdfIn PDF document text
    • https://nopetozu.weebly.com/uploads/1/3/4/5/134507327/majimidanaxasi-povut.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/ijhNavZ/viboxovejabufuvufabodowu.pdfIn PDF document text
    • https://ravojinukof.weebly.com/uploads/1/3/4/4/134476618/fuvet_peverojokadasip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vumamuv.myartsonline.com/wivabulam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b787b92f-d82a-4475-a40e-b8e8870a446b/fedex_tracking_number_lookup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25361670-b60c-4c4c-a44c-2864a3e4cd81/how_to_use_adobe_acrobat_pro_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e08eeef-c957-4f39-8ed8-1400554aacde/batman_the_dark_knight_returns_part_1_2012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28015735-ca80-4b7d-a72f-2a6e5ed96c53/which_hand_is_read_in_palmistry_for_ladies.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 3204 bytes
SHA-256: 80b2ccb3fb956ef655f6f58771a2b41a3faec88bedbf7d86f85f7354ca9dcbf5
font_01_sfnt_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 5276 bytes
SHA-256: 67305c8b8d3a8e7485bf9c919a5d468a58a3f232bdfe3e8af66bfdbd97a0ec58
font_02_sfnt_off00010add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADD 10836 bytes
SHA-256: 8513160a20af2accff60c8261ab3275b38f5511383d98b628b06a71c3ddcda6f
font_03_sfnt_off0001301e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301E 17044 bytes
SHA-256: 3c98319d6b0bd41c63e5470555ca2cd0bfa662e94fde45fdf3a3aeffe604ce18

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