Malicious PDF — malware analysis report

Static analysis result for SHA-256 647073a8c8293b86…

MALICIOUS

PDF

100.7 KB Created: 2021-04-03 13:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fcbff66bec97b7831ce4fe37fa3527a2 SHA-1: 72e9435484d774ef50ec19f014b5a5ca80698947 SHA-256: 647073a8c8293b86f16cd2263d0f24611cb330a5561320ea058ffb62d5faafc4
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 0.9989

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://golowaki.ru/strik?utm_term=chinese+pit+bike+dealers+near+me PDF link annotation
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/fa90300d5.pdfIn PDF document text
    • https://wesarifalonaba.weebly.com/uploads/1/3/5/9/135961423/sopopif.pdfIn PDF document text
    • http://eurozone.pro/movimiento_rectilineo_uniforme_velocidad_constante_problemas_resueltos4q4n2.pdfIn PDF document text
    • https://kewejalafu.weebly.com/uploads/1/3/5/3/135329801/darolekibuwigene.pdfIn PDF document text
    • http://reduslim-buy.site/18962756886ih39r.pdfIn PDF document text
    • http://torchland.xyz/17685520006jkhyi.pdfIn PDF document text
    • http://mirror-x.org/21820928146jaj59.pdfIn PDF document text
    • https://leditolovon.weebly.com/uploads/1/3/2/6/132682688/tefavivaga_felijutivi_tifigufiwofol_jenevuf.pdfIn PDF document text
    • https://feloxoxux.weebly.com/uploads/1/3/4/0/134000485/gozes.pdfIn PDF document text
    • https://gegiwozik.weebly.com/uploads/1/3/4/7/134719936/tovep_finegetivinoti_walas.pdfIn PDF document text
    • https://pejedakava.weebly.com/uploads/1/3/1/4/131453393/gilurajidipizeta.pdfIn PDF document text
    • http://idealica-italiauficiale.website/47192577225q8t8f.pdfIn PDF document text
    • https://naxosunibeg.weebly.com/uploads/1/3/4/6/134676516/5524413.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vugixemavofagen.epizy.com/potogujok.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_9e25bb3a310c4dc4bf311a114da738bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/544297d0-e07d-499f-9903-e27d5dc7f033/los_tipos_de_comunicacin_que_existen_hoy_en_da.pdfIn PDF document text
    • http://zamonile.epizy.com/coordinate_geometry_worksheets_high_school.pdfIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_7dca9e6d42ca4bdca81bc085351dfeb6.pdf?index=trueIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_ead2cb153e864966b7e9830b9bc95f02.pdf?index=trueIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_d663a54631564e3d96a74a102f78020f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64f065da-2b54-485e-85ee-057f0eaca501/how_to_descale_avent_electric_steriliser.pdfIn PDF document text
    • http://wosotufozutula.epizy.com/14187409020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0643748-2446-49f7-b698-fc339a521409/how_to_take_cdl_permit_test.pdfIn PDF document text
    • http://newitipalude.rf.gd/mezazapawepupepisafufot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5fa18be-447a-4052-ac8a-ee21110da14b/xiligejejapoxibaputegore.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_off0001481b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481B 5308 bytes
SHA-256: 182e4d594d9014b4d87c3b20e57f50b90cac6200b1b97f9044b7c865afb00387
font_01_sfnt_off000159ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159ED 12608 bytes
SHA-256: b9544b4a82033ca135e4a05fdccbb347c22008dea4928f8171c9aa32c3dc6dfc