Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdf3c466cebb527…

MALICIOUS

PDF

85.7 KB Created: 2021-05-17 11:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a8ad9d1d148875b22068ad35fa705e63 SHA-1: ef065330907c06e377fd2fbf01be9b3ebc23ef33 SHA-256: 4fdf3c466cebb5278948223cea2923166d1206159e170d743a165cbbea750511
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-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://lozipotod.ru/strik?utm_term=ninestars+trash+can+lid+adjustment PDF link annotation
    • http://kevufeduwatawos.mypressonline.com/29233875118.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/cdisc_sdtm_implementation_guide_3._2.pdfIn PDF document text
    • http://parovosi.mygamesonline.org/60018756900.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/gfq1V1p/dovewamiwitajubufotadog.pdfIn PDF document text
    • https://cdn.sqhk.co/didatife/dgggdtX/gangs_io_online.pdfIn PDF document text
    • https://melonugijiroduk.weebly.com/uploads/1/3/5/3/135325977/fenoximilexokot.pdfIn PDF document text
    • https://bipasakugerada.weebly.com/uploads/1/3/4/3/134350286/425366.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/cjhGfjb/mizekov.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/how_can_i_tell_what_year_my_samsung_smart_tv_is.pdfIn PDF document text
    • http://fibiver.mygamesonline.org/pafinubonefovibu.pdfIn PDF document text
    • https://jumufewaxijakuk.weebly.com/uploads/1/3/1/3/131380308/4236956.pdfIn PDF document text
    • http://korirojasutito.22web.org/pugowimonexikupusiku.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/waxabavebajewoga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/facebook_nokia_5233_phone.pdfIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_9a878f7f2b1c4c4ebef2bc74b2d264ca.pdf?index=trueIn PDF document text
    • http://labujuf.epizy.com/carta_descriptiva_definicion.pdfIn PDF document text
    • https://23fe9111-5aa3-4288-b7a4-a84c242bb647.filesusr.com/ugd/d35b85_279cf837dc91478f956fb6a00281a1cf.pdf?index=trueIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_6410b7acb84b48d5b842f81c6bfa8df2.pdf?index=trueIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_c4547da541114fcb9c912e97f5620aca.pdf?index=trueIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_5346586a6e574eae858e110943f0c3d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wopari/filavanixoketip.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/23509327867.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_off00010fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 5224 bytes
SHA-256: 7a3bcaa52ec13dbc12d72b8d213fc6ad914aabc66c8935861d3195b67a42e6f4
font_01_sfnt_off0001219e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219E 11892 bytes
SHA-256: 4ad54e1f2a51d0192d05b529643703af8a073f05edbce85a6f934395aaa9146e

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