Malicious PDF — malware analysis report

Static analysis result for SHA-256 26cd8f20c9d3f897…

MALICIOUS

PDF

77.6 KB Created: 2021-03-31 20:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 68364441025ef06d980fd2ed72b7a1a8 SHA-1: 9e005b5499535116e4a8c85f3d7a5df16a359089 SHA-256: 26cd8f20c9d3f8975645f95a77e76ec190f5eee66f6b28109da91e8daac2e463
194 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of a 'download button' lure further supports a phishing or malicious download attempt. No scripts were extracted, but the overall structure and link farm indicate a likely attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/award?keyword=morgan+anesthesia+5th+edition+pdf+free+download PDF link annotation
    • https://tutuludoj.weebly.com/uploads/1/3/0/8/130874598/e98edeec09.pdfIn PDF document text
    • https://davabodijesofid.weebly.com/uploads/1/3/4/4/134474123/fubikovanenet.pdfIn PDF document text
    • https://cdn.sqhk.co/zaletimerizo/gevhdRy/68761744959.pdfIn PDF document text
    • https://cdn.sqhk.co/kadukugobug/2QHbFhi/callaway_golf_driver_used.pdfIn PDF document text
    • https://cdn.sqhk.co/kamozipu/hf0njiu/68933406986.pdfIn PDF document text
    • https://bemujegifa.weebly.com/uploads/1/3/5/3/135312506/3959525.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/vaywie7/7044305087.pdfIn PDF document text
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/xowufaxal-pubafadige-wubexesesuku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_10b9844092724e328e9198b221224173.pdf?index=trueIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_05fa9b62002f4acb9fb7abf40c6ad181.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/can_you_trick_tinder_location_iphone.pdfIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_0ac8a391e3d2411fa0a19d2bf1413d55.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxunaf/potodofemozuzenosorob.pdfIn PDF document text
    • https://ecf1b359-4982-44d9-836f-7e6f5fec4aa1.filesusr.com/ugd/da15c8_9d956ba734fd4a408d8c12633c4cbde1.pdf?index=trueIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_8118f05804c54b6aafc73491e57a8939.pdf?index=trueIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_6538224b0acc4de0baf64f80317c0dd9.pdf?index=trueIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_679c00d3c9d84d44b137f0f5ff8769d0.pdf?index=trueIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_1513ecbe99d94b5c9680c3416329758a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/82028489827.pdfIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_286a084599f74056a27ff82edb4f4792.pdf?index=trueIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_23ced041ae2641eea515dd4274f7d29b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/pijuwisizonekifijij.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_off0000ed9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 5524 bytes
SHA-256: fd5cd73eddf6c256fae287d6d762b64f1529ceca33619223c6ef4ea8c582a1a2
font_01_sfnt_off0001007d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 11120 bytes
SHA-256: 033c415bffe1aed8c78dd84d7d2d8c0911e714cb0941a9e003030b47db940f07

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