Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ba4c4bb8fb4088…

MALICIOUS

PDF

62.1 KB Created: 2020-11-07 01:19:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 850f4050efec190503a0bbb6838cee10 SHA-1: 9813264acab36ba8c181680d730a2b0bdf4fef03 SHA-256: a1ba4c4bb8fb4088a233166eaaccaf1dad90edf6c1a51191244b56a00a7b2441
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The embedded URL 'https://trafficel.ru/aws?keyword=butcher+block+counters+cost' and the numerous Weebly links suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://trafficel.ru/aws?keyword=butcher+block+counters+cost PDF link annotation
    • https://jodotabamusunew.weebly.com/uploads/1/3/4/4/134402052/tudejipidunuzu-wopepivilaxifir-bixagobirep-xuvunixibegase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371246/normal_5f885b96c9d30.pdfIn PDF document text
    • https://purolejomi.weebly.com/uploads/1/3/0/7/130776639/xigurikikimotexejo.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/xumemakebufama-pekabirafumuko-voxonudika.pdfIn PDF document text
    • https://fuxomiluzixoxam.weebly.com/uploads/1/3/4/5/134594746/vigoviruvotup.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/4165744.pdfIn PDF document text
    • https://vomediwanuxorat.weebly.com/uploads/1/3/4/3/134327005/47cae4be6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_5f96dc73be3a8.pdfIn PDF document text
    • https://vidojibirulon.weebly.com/uploads/1/3/1/0/131070792/tokuw_rijigig.pdfIn PDF document text
    • https://tetagusupawuwag.weebly.com/uploads/1/3/4/5/134586179/maxiloxulo-geselajera.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/51b5589b-5d72-48dc-9be6-abd65ca24f0f/36053608477.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/56970182667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a94a2e3c-9d43-4f70-9b98-22494c13f944/61695053659.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA723 4764 bytes
SHA-256: 37441db0028c8eff254635211b8357212ac1107783c81a18a0bfaf3fb1098ef7
font_01_sfnt_off0000b74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74D 10812 bytes
SHA-256: e30716d912223d7f777a861d6a69df2d10e5fe57e9299ba67038b9f1b3e030ff
font_02_sfnt_off0000dbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAD 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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