Malicious PDF — malware analysis report

Static analysis result for SHA-256 054f473e6eea32d2…

MALICIOUS

PDF

78.1 KB Created: 2021-06-05 14:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4a75941be93097a7f162bd4be6e82f8c SHA-1: afdbb94e267f6a4397337118efdc5b7645bd4b4f SHA-256: 054f473e6eea32d2b81af99dbd328361946d0e6f4352b6f078c0e2337ce6feab
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/123?utm_term=astrology+zone+app+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393511/normal_6027c222c30fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427780/normal_6032f17a92fda.pdfIn PDF document text
    • https://tesujirigagorin.weebly.com/uploads/1/3/4/8/134869290/fowazemo.pdfIn PDF document text
    • https://benowanazopawa.weebly.com/uploads/1/3/0/7/130740092/buxajofutija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426062/normal_6019f616adcc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464850/normal_6032f0f27aaed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411922/normal_6004c48d6718f.pdfIn PDF document text
    • https://joligokexiviva.weebly.com/uploads/1/3/7/5/137502163/jimategokubojugovudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447270/normal_603bfada58647.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mujefapufefi.pbworks.com/w/file/fetch/144510768/71178488311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/778ed020-b97a-4336-bc27-2a2af1d82121/how_much_water_in_philips_avent_sterilizer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d36aafac-081a-487e-bfb6-2ef20728301b/pulafakasajavili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53d7ccb7-3a3a-4455-b8f7-b406a78a31ce/como_convertir_gramos_a_mililitros_online.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/examenes_resueltos_potencias_y_raices_1_eso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3899909-081e-4920-b436-295bf8714295/ruzesifiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2315bb3-3ae5-453c-bf0e-4876ec37f5e5/singer_tiny_tailor_tt600a.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9977e3cd-2d85-4e75-bc68-e2945e1e2c89/how_to_open_up_a_fantasy_novel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aca3ed7-7a0f-4cd8-b771-95ed1fd7cd97/44274600470.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144416472/bumelasumetijekison.pdfIn PDF document text
    • http://tejudafo.pbworks.com/f/how_to_use_the_control_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/078f74a6-e03d-4cdb-979d-c89c7f36c218/98420897652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/635bd6dc-af80-4ce2-8b31-e3b338a1dd19/voyager_diana_gabaldon_quotes.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_off0000f693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF693 5208 bytes
SHA-256: 5dce7cf81154c1e68c8412206cc0dc4d09b2a6cbf4275f2ae8aeb464450542ff
font_01_sfnt_off0001086e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086E 10200 bytes
SHA-256: c1ec44daf074990bff1920f0dc68b331da2acb03076b341ad2fa3d457ce1094d