Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca4db4f16b61636…

MALICIOUS

PDF

82.7 KB Created: 2021-03-05 19:17:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1055043c072f3d102a78d3b2527d7a97 SHA-1: dfdf395d484cdd4d0956ebbea5b782fd7c81eb4a SHA-256: dca4db4f16b61636ae18fa52021cb15a3581c4f1541441f287d2cbfa2d0b0835
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://baarspo.ru/strik?utm_term=operating+system+concepts+9th+edition+answers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372955/normal_5ffd3acc3e3ec.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/ujfjign/10953164771.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/bleach_brave_souls_rerollh5le9.pdfIn PDF document text
    • http://romeital.space/registration_form_template_html5u04ql.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/ar3gff4/dreamers_vault_facebook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428078/normal_600e8c9257acc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_601e174d18a64.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/iciijhE/pufulamug.pdfIn PDF document text
    • https://cdn.sqhk.co/wenejusuzixe/xl5Keji/jafazilijumola.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/5Ahczih/vukidin.pdfIn PDF document text
    • https://cdn.sqhk.co/gafazakedoki/Ms6EhdX/faces_of_illusion_the_twin_phantoms_review.pdfIn PDF document text
    • https://cdn.sqhk.co/dawupana/idgdgjO/berelanoletorutitesite.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzikewed/Ojd9INK/25543391040.pdfIn PDF document text
    • https://cdn.sqhk.co/vabadoma/OhjgiRB/top_boat_racing_simulator_3d_hack_apk.pdfIn PDF document text
    • http://khareedforosh.com/minaronefasuzavawoxokolx6s9.pdfIn PDF document text
    • http://p-kavkaza.ru/7893467459060r4s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_2bd5827835cc436794934c296d93c11e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa408461-7c0a-463a-b40f-caae8da3c9da/can_you_get_free_xbox_live_gold_codes.pdfIn PDF document text
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_2f864d7dec9242abbb390bd7884bb859.pdf?index=trueIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_374af087ebc342a68a545ba9137e0b95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c088428e-65aa-42ec-a036-be0ef9ef7986/what_is_a_straw_man_fallacy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b16b534-7dba-4f20-a14a-cefa7e6aa2d5/jedesikexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3adedd0-5369-4042-a0ef-563c3b8668f4/download_realtek_audio_driver_windows_10_64_bit_lenovo.pdfIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_ddfde01b0af3499182f2de1ce7ee50e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b30768dc-be7b-4e1e-bebb-24528b0e174e/jewenozakevateforowob.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 5912 bytes
SHA-256: 7d2a93c0ede101b62553310f1a33b28139d25fac4f4eccaec9ceb306c07c5421
font_01_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 4628 bytes
SHA-256: a7c14652faccde8cafb1494e9ca35ae1cb7a7fc021172164049f7e8a6ebda76d
font_02_sfnt_off0001175e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175E 10740 bytes
SHA-256: 8caf885f7050fd57dca4be471f0d671a78d607d1aa8ee4429800ee8e4080ec90

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