Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6ac29c07393cb8…

MALICIOUS

PDF

79.6 KB Created: 2021-03-04 00:22:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 83ca7c850cbccd66ea2a99c4037215c7 SHA-1: df8301235a25367a044ed5ca176e38e60f475000 SHA-256: 8b6ac29c07393cb87d8b817b55405b9ba24b3b3f9249bb83cb4c21d39a115283
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm designed to attract traffic or distribute further malware. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of numerous external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://ponafet.ru/award?keyword=how+to+calculate+principal+stresses PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501495/normal_5fcbc505a5583.pdfIn PDF document text
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/9641193.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487187/normal_5fde713930306.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447884/normal_5fcdcee41f488.pdfIn PDF document text
    • http://thecabinets.xyz/cisco_catalyst_3850_configuration_guide20s6m.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/dl2DAmV/jogos_bubble_shooter_online_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391954/normal_6032465234f1e.pdfIn PDF document text
    • https://mafaredoli.weebly.com/uploads/1/3/2/6/132695491/fb1e6be.pdfIn PDF document text
    • https://wezusutuxalik.weebly.com/uploads/1/3/1/6/131637092/c0b0918219b80.pdfIn PDF document text
    • https://sikufotoxatufik.weebly.com/uploads/1/3/4/4/134458503/povumopobox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nelodetasa.rf.gd/susek.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/microsoft_sharepoint_server_2013_end_of_support.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/inter_first_year_books.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/bivopekujeva.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/capital_expenditures_balance_sheet_income_statement.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/landlord_guarantor_form_template.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_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 4980 bytes
SHA-256: 6de8dc14c30851a87a7a15c0224244a5836219bdeb2ae6e12255a26e7de52e23
font_01_sfnt_off0000fef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF3 16152 bytes
SHA-256: e3b6d16b02095a2388740244fd4e510191071fa5d4cc32ab2e6866bca55e8c1a

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