Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6749c971fc4cc62…

MALICIOUS

PDF

64.9 KB Created: 2020-11-17 04:43:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b6543b065b4577d7592b19576779dab3 SHA-1: 906e3652ede79621408d16f549fb203063b3e1a9 SHA-256: a6749c971fc4cc62d8a796ccf6b8f0197616c0a63f80669fc6f6dfcff3e86ffd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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 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://traffking.ru/123?utm_term=kizi+100+car+games+unblocked PDF link annotation
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/rezovovob.pdfIn PDF document text
    • https://komamopiragi.weebly.com/uploads/1/3/4/4/134444029/3845739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382193/normal_5fa08c0142446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_5fa780b06fc2b.pdfIn PDF document text
    • https://josifepuwiden.weebly.com/uploads/1/3/4/7/134749262/7f633324cbdc.pdfIn PDF document text
    • https://wumunelopilum.weebly.com/uploads/1/3/4/3/134395902/66123c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484804/normal_5faf693119d44.pdfIn PDF document text
    • https://nawajutexi.weebly.com/uploads/1/3/4/1/134108687/5129771.pdfIn PDF document text
    • https://xeponadutowa.weebly.com/uploads/1/3/4/6/134612209/a6b395f307300.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/xunitex.pdfIn PDF document text
    • https://kowojifab.weebly.com/uploads/1/3/4/6/134622532/dusawujigemup.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/84875129-404b-495c-baed-3a3495c538be/spore_print_to_agar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bfd7757-1dfe-4a5f-8f66-366d7ac58081/55799227671.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/359c02e9-0f0f-43c6-8565-2390d98e4c78/arcadia_high_school_phoenix_demographics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dca1fd4-dbbe-4a89-bd39-5adb4b2092ed/44779910141.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_off0000c16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16F 5676 bytes
SHA-256: a6b0d4dea915d752fae456a6ae6b4fbfcce8070da0ae17e5540a9c98d091e3f6
font_01_sfnt_off0000d4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AA 9980 bytes
SHA-256: 41a981f53cc1bbada3d61ac6dd16ec84d50421edb5fd9d0afe9709af59827826

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