Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c5602d2115b4b4…

MALICIOUS

PDF

73.9 KB Created: 2021-04-08 07:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1b76258451359a2b2bf719e30f5beb00 SHA-1: 4f172cb8129ff2bfe4f926bec80ff0754e7ffdc6 SHA-256: b8c5602d2115b4b400c5a166eab95f788031aa5c9f832f43c2882ebdacc84871
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The presence of a URL with a 'utm_term' parameter suggests a phishing or SEO manipulation attempt. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its deceptive content and link farm structure.

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://seumenha.ru/strik?utm_term=best+viking+appliance+repair PDF link annotation
    • https://notowupoguja.weebly.com/uploads/1/3/5/3/135316513/9045238.pdfIn PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/fizalexumonig.pdfIn PDF document text
    • https://cdn.sqhk.co/jadizefon/fP9jhgg/monstera_monkey_mask_for_sale.pdfIn PDF document text
    • http://guzexesuge.mypressonline.com/83102246172.pdfIn PDF document text
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/debed.pdfIn PDF document text
    • http://guferesuzas.22web.org/old_school_calisthenics_program.pdfIn PDF document text
    • https://musuvawe.weebly.com/uploads/1/3/4/5/134528527/2cba58ed382.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/GigXgcL/my_ufone_number_is_suspended.pdfIn PDF document text
    • http://menesoger.iblogger.org/derogable_and_non_derogable_rights.pdfIn PDF document text
    • https://todumubisopid.weebly.com/uploads/1/3/5/3/135312552/fababa5c.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/aashto_green_book_2020_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxosavor.rf.gd/69451174331.pdfIn PDF document text
    • https://e2a3f85e-3ce8-4c76-99a2-e63219cad5ad.filesusr.com/ugd/473d25_99e76bf71eda4a39b9c95c44a10a7833.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/xagovojaxera.pdfIn PDF document text
    • http://xilawon.epizy.com/polarity_therapy_book.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/56270356531.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/safawalolaligeterewo.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/unforgiven_book_5_of_the_fallen_series_summary.pdfIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_1ad42113c5984c828802764defdd642d.pdf?index=trueIn PDF document text
    • http://disoluje.myartsonline.com/17096312153.pdfIn PDF document text
    • https://620678a0-8f5b-407b-881a-8a96a128c1c4.filesusr.com/ugd/25b7a6_1ec2da22ccdf447e8b43fc227b961636.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_off0000e579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE579 5272 bytes
SHA-256: 08a87cc32c4bb03c3540bb68c86b935922477f0631793d722efa0395e6a42644
font_01_sfnt_off0000f789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 10048 bytes
SHA-256: d508468efe1f8c75ce3f250d7e888884b7985cfc09889ec6bdbbbd9db9bec474