Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aeaa83cc8e2e424…

MALICIOUS

PDF

70.5 KB Created: 2021-03-29 01:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bc0340a994376d878b3a1ea84c9a29dc SHA-1: 9ae5f7bd44028f4f2d349288856dac17c36169b7 SHA-256: 6aeaa83cc8e2e4242d3195847c9a5bc7bd65d626e1ea8c0087be17fc65e08695
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://seumenha.ru/award?keyword=drenaje+de+absceso+dental+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482402/normal_603ce86cd325b.pdfIn PDF document text
    • https://saxarewuvopa.weebly.com/uploads/1/3/4/8/134855039/9cd167bc96b83b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392652/normal_6057992a1bff8.pdfIn PDF document text
    • http://classkaod.ru/64062387247ovjjj.pdfIn PDF document text
    • https://cdn.sqhk.co/zujadibarise/ibT2Gge/21416000526.pdfIn PDF document text
    • https://sidedelozamuk.weebly.com/uploads/1/3/1/4/131482822/tadaravobukige_demopi_lasetid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402280/normal_6044fc98804d6.pdfIn PDF document text
    • http://znasila.ru/3d_sierpinski_gasket50tb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414689/normal_5fca2a0ecb69a.pdfIn PDF document text
    • http://repair-monokoles.ru/lg_inverter_direct_drive_washer_dryer_error_codes5m6fl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374835/normal_6060827cdaee0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408352/normal_601d007b45603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479942/normal_604f4e61a4e7c.pdfIn PDF document text
    • https://cdn.sqhk.co/nagebagem/geKnRgi/96117778595.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/7fef4a25-4a63-400e-9b85-816e99efffa3/lean_startup_business_plan_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a5518b-87ac-4815-99ca-7887104ffcdf/22017297026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9413390-2dec-433c-84cc-3f16ee713e8e/how_to_use_range_rover_rear_seat_entertainment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e533cb-a217-4de9-bee8-9b58ff182965/76690189223.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_off0000cbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC8 5104 bytes
SHA-256: 717b5b19ab029211406141f01bf692634ae79a13a7c57ecfa0ccab66c07accc2
font_01_sfnt_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 9736 bytes
SHA-256: efc950d42be95c3a51024c28636b8c94471c6263c9eb3da23574679cd9101926
font_02_sfnt_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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