Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d00848d9fcdc219…

MALICIOUS

PDF

64.9 KB Created: 2020-11-12 21:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7ad0ae5bb6626ca767e20d7e3da2c96f SHA-1: d5a1283e0164bc1ed1a9d6cf5bf7d6676af69288 SHA-256: 9d00848d9fcdc219c6410558163045e6668fa035cf0fa015e831f4fcc5a0487f
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://traffnew.ru/123?utm_term=rock+texture+seamless PDF link annotation
    • https://genamimiwovem.weebly.com/uploads/1/3/1/6/131636881/newibuwo_sebabamijosup_naxuruvebiwina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_5f97a2c748388.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/dovones_davazulaw_garufivotada.pdfIn PDF document text
    • https://nutolifawivu.weebly.com/uploads/1/3/1/4/131437776/16b3a2211e4ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408858/normal_5fa3a179bd87e.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/tiginun.pdfIn PDF document text
    • https://ravikuzisuwu.weebly.com/uploads/1/3/4/4/134470025/rogitadevofezuwax.pdfIn PDF document text
    • https://guvapokasek.weebly.com/uploads/1/3/4/4/134437462/2843744.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d87f9e2b-a9d8-4041-8dbf-ef55249951ba/luxikemosukujipebid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02bfbdff-87bc-45a9-87f9-5e5fd8a146e7/79370547045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c63c540-3c44-4ff5-b6c3-88e2f86d9792/pukotirizegiwaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0862278f-077a-4ba5-928d-75a3b1ddddf3/vemipelisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73ad6cac-2e04-4ad3-904c-79ecaa8c006b/nimitz_elementary_school_staff.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_off0000c28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28B 5084 bytes
SHA-256: 7d020d8cb41183cbfdc85fe999cda65e6e81764fd033f1f4423c1519ddc186ce
font_01_sfnt_off0000d3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C9 10216 bytes
SHA-256: a8b1903b24ff58f6c41b89b438be56fff98d5d4e18897364bbe5aef1e0342fc0

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