Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb4407901e6f23d…

MALICIOUS

PDF

76.1 KB Created: 2021-06-08 00:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 563e6645dafe36393807d327b820db62 SHA-1: 663b4a2d7780b19d9f915e0db9955a6b774a77db SHA-256: 5cb4407901e6f23d82c80b5124e48eabbe0e053535aaca6b1beda14c28e1722d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links pointing to various domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or distributing further malware. The presence of multiple disposable hosting domains and UTM parameters in URLs further supports a malicious purpose.

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
  • 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://dugedepap.ru/123?utm_term=jurassic+park+theme+piano+sheet+music+easy PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366662/normal_60035ecc37ef4.pdfIn PDF document text
    • https://pogusunuj.weebly.com/uploads/1/3/4/8/134874329/lesonosupofe.pdfIn PDF document text
    • https://wibafodutaselo.weebly.com/uploads/1/3/1/3/131380847/3785062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_606d47e986401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476437/normal_604d2fadf338c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5fde9d489e196.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417983/normal_60030a84a7dc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471114/normal_60bce7cdae549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473031/normal_602c2e1b351a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puzavofan.pbworks.com/w/file/fetch/144579870/ejercicios_de_motricidad_gruesa_para_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d976f2-07bf-48c6-869c-caeb575a7eaf/sinuzita_cronica_maxilara_tratament.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bee4f8b-74b1-49f9-aecb-8acd046b65cc/rolasudixosijutuwunezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ba7a98-2f45-4635-aa4d-84a43097157e/santa_claus_is_comin_to_town_song_bruce_springsteen_lyrics.pdfIn PDF document text
    • http://lexibitite.pbworks.com/f/what_are_the_problems_associated_with_rural_urban_migration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/239df929-39db-4d56-a184-73b1a44c0630/the_hound_of_the_baskervilles_1959_blu_ray.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58038808-a0b7-4c83-a0ee-caa8288f41e6/89543635754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e09cfbd-6f98-4f2d-a37a-dc635a8b40b7/the_ghost_writer_full_movie_download_in_hindi_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cce4ab00-0a61-4910-8624-d88273a605b9/hundreds_chart_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddacdc1c-fbd8-4e1d-9896-151ccac9efbd/55281157671.pdfIn PDF document text
    • http://papoxuva.pbworks.com/f/gawileridipuneva.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADD 5296 bytes
SHA-256: 338b49dbbf18919d7887007f7005a51ecdcde5878839e2c545b4356037133546
font_01_sfnt_off0000fcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBD 11228 bytes
SHA-256: 3cbb0ac7dc71e9e2874b6552539a09654588bb14fc63f5bff4daa66a79d323b1