Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdeaedb3a9bde017…

MALICIOUS

PDF

78.0 KB Created: 2021-05-09 19:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 72c111b7ea680797a8e43f73f2256e76 SHA-1: 28247b05925c626226d390cf436ed324bde6ceb2 SHA-256: fdeaedb3a9bde017fd96100c6d6f1faeaf67730ef745c63b70c0c7aaf2d4b76d
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO-based link farms designed to redirect users to harmful sites. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=humminbird+fish+finder+transducer+mounting+brackets In PDF document text
    • https://pamaxorakumi.weebly.com/uploads/1/3/4/0/134019068/mederadepen_donugetenotar_wosozufukewi_tikiburogavam.pdfIn PDF document text
    • https://tedudizoz.weebly.com/uploads/1/3/2/6/132683188/rimarenukite-biliwobuba.pdfIn PDF document text
    • https://munemajof.weebly.com/uploads/1/3/2/3/132302982/4525149.pdfIn PDF document text
    • http://nefetenebubuwid.iblogger.org/systematic_investment_plan_guide.pdfIn PDF document text
    • http://kojovud.iblogger.org/evenflo_pack_and_play_mattress_size.pdfIn PDF document text
    • http://dirupomavi.iblogger.org/spypoint_camera_phone_number.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e28b13d-ef5c-4d18-821e-e071a8932918.filesusr.com/ugd/0b0738_65abbaebcae94a7b9d91460569432ae7.pdf?index=trueIn PDF document text
    • http://xesoduzojisore.rf.gd/aggression_replacement_training.pdfIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_0522d4a42711402cbc10c747df6c01fa.pdf?index=trueIn PDF document text
    • http://morubuzis.rf.gd/ashraf_ali_thanvi_books_urdu.pdfIn PDF document text
    • https://da4cb982-96ac-4827-b01c-1601b1c9977c.filesusr.com/ugd/b05c40_bf718d57394f45c687554fdfdf1b0976.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_be1b7adeb1d1464096afdd7a97abd04e.pdf?index=trueIn PDF document text
    • https://db6a684c-bd73-4a61-997a-17040cc1d896.filesusr.com/ugd/bbbb20_a931437ee6f640b299bdeadeebe2828e.pdf?index=trueIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_68ea144f51ee4539bdba1dd653ddc1d3.pdf?index=trueIn PDF document text
    • http://sokiguxesixup.epizy.com/calidad_de_vida_2017.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_01595ccf4b5a416f8d85cfbbe218155d.pdf?index=trueIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_b079b11fbdcf42e28939f87399c2b4a3.pdf?index=trueIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_fc5b907ae8814a30876eeea6ab82da2c.pdf?index=trueIn PDF document text
    • https://f79c4d19-9b07-4ca9-ba82-4f938217db57.filesusr.com/ugd/c0d3e8_7af047bb8dad498d85645c29403753e7.pdf?index=trueIn PDF document text
    • https://2e21b658-2967-4279-8f18-a03590b678a5.filesusr.com/ugd/f5e1b2_2b386767411f49aab623f68757e205b9.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 5568 bytes
SHA-256: 1697995a77c9223adf4f4e1151ed25ec7eb06c01bef9f95337bcf58e33ff7153
font_01_sfnt_off000102e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E6 11648 bytes
SHA-256: fb2b95125e90726c70ac819c8c84af90aba7208ce7379182d796a55eb04508c6