Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd888fc4c941919d…

MALICIOUS

PDF

72.0 KB Created: 2020-11-28 10:22:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7989b64fc736553b9de269ba4ff96cf9 SHA-1: 6a64cf22d8c910042a9e030236051b5cf86eaa6b SHA-256: bd888fc4c941919d4b62dfee094cb8baa373c76f88192fcd7f665f02b5b53f02
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://trafffe.ru/aws?utm_term=chudi+jo+khanki+dj+song PDF link annotation
    • https://dodafuwunolig.weebly.com/uploads/1/3/4/0/134016835/acbc24795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_5f9e087334270.pdfIn PDF document text
    • https://nabofirolem.weebly.com/uploads/1/3/4/6/134632364/6557669c8344.pdfIn PDF document text
    • https://nijolajosota.weebly.com/uploads/1/3/4/6/134678148/lasaredibixuxixezu.pdfIn PDF document text
    • https://nabolonoroxene.weebly.com/uploads/1/3/4/3/134373159/1857103.pdfIn PDF document text
    • https://lifeweroni.weebly.com/uploads/1/3/4/3/134358493/begukurejejokojedaj.pdfIn PDF document text
    • https://wegupufula.weebly.com/uploads/1/3/0/8/130813429/0f4b9d34833f5f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/1232d16b-af42-4838-aafd-622fbae09a1e/navowoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a5e021-9ca5-4309-a5bf-5891410749aa/30468344465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e0b1bc3-9092-46f6-80b7-d4d4ad10270f/a_case_of_exploding_mangoes_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68cf56bf-0eff-43b1-ba82-fba648e79805/crestwood_library_il.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efa068fa-a9af-4423-a3f0-d9151f13672a/magic_bitter_magic_sweet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03b030c1-b58b-40c4-9c8f-67a3b4a6d2c4/54563173944.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_off0000c8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F0 5004 bytes
SHA-256: 92c81443763da23009caaa77779c1bca1145e447f78830fae11b2456634dbb21
font_01_sfnt_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 10896 bytes
SHA-256: 6cd58ac70688ffc76ef2a9ba0d1a3734ec80c60ed43df9072f1bafe73a1604d4
font_02_sfnt_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 5864 bytes
SHA-256: f3cbfd93252f3de4cafb0fb40200e75d0f9f9dd3986eb020de60af7f946fa532

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