Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e8bd20ed205424…

MALICIOUS

PDF

77.5 KB Created: 2021-03-17 15:52:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b6ac136400612902baf2b9116b6a347a SHA-1: 107a0640d78fdd0465b38438318fd23d833b77b0 SHA-256: c0e8bd20ed205424bda70f92fdd41ee34725dfdcbb003593739ff21169d3864f
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 0.9993

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://ponafet.ru/123?utm_term=charcoal+bubble+sheet+mask+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460944/normal_5fd27a28660d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_604222ece1ab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470400/normal_602779981d934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389361/normal_5fe61d3f8bf61.pdfIn PDF document text
    • http://nebo-baikala.ru/samsung_android_tablet_chargeryf6fb.pdfIn PDF document text
    • http://revebinepuv.iblogger.org/bonfiglioli_catalogue.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480893/normal_602b63eaebc3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476765/normal_5fcf2bfadb105.pdfIn PDF document text
    • http://about-central.com/94318034788ly5l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488137/normal_60403aef2bd70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423454/normal_6050c9d1810e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412887/normal_5fc9ab24dc57d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412382/normal_60247bf7301cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_6016de73149fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491437/normal_6038518022657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476768/normal_6017212d45ad5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lefarobi.rf.gd/43778556297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/179b2fc1-8d1e-48a3-9898-1a32b7803e52/how_much_should_it_cost_to_replace_a_watch_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c81fd0e-4c84-4b38-a37c-d3dd486bd1b3/jusoguwamosaleraziwamilav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c1852ff-3ba3-46d6-ad45-91d64990f880/88066731670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2f99492-90c5-48bd-916b-d250421ee138/56100935654.pdfIn PDF document text
    • http://vusevupitiwo.rf.gd/26900135976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87f3a282-c86d-404b-ae25-111fecf93de5/five_nights_at_freddys_2_unblocked_games_scratch.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_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 5300 bytes
SHA-256: 349e785ac6f18e76805db5b4b49e3079f7eeb355495a777280fb172f0183feab
font_01_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 10948 bytes
SHA-256: e220a9c0f6d37f46f4f3765bae265707f4e741840e5254ae6d73c469690b8452

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