Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a8a9bbc8267fa7…

MALICIOUS

PDF

67.3 KB Created: 2021-03-30 06:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d1b81b19ee14a7e7dbdbf8377c211e44 SHA-1: 114382cf9dd4f589756e6bd77eaf92a73e134088 SHA-256: 23a8a9bbc8267fa7fefdd73b99535ba64e0bced66609faf00b416bff193b45bd
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=rangkuman+materi+biologi+sma+kelas+10+pdf PDF link annotation
    • http://limons.space/mastering_the_art_of_french_cooking_recipesu3svd.pdfIn PDF document text
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/porarinenezadajim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385011/normal_60554e9b727ff.pdfIn PDF document text
    • http://pay-order.info/tejusoganirigesomubsijjk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486550/normal_6044a08ef1a18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404310/normal_5ffe183320045.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/which_is_the_best_calculator_app_for_android.pdfIn PDF document text
    • http://kismykeitio.best/14535011141srzju.pdfIn PDF document text
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/rutidutuxuxefeb_vipobikogufune_xabejazisa.pdfIn PDF document text
    • http://dutov.org/wokarepipotafezareh4sf7.pdfIn PDF document text
    • http://ipatovaalena.ru/32484673931kfwdm.pdfIn PDF document text
    • https://suguturame.weebly.com/uploads/1/3/1/4/131438741/2622da7.pdfIn PDF document text
    • https://ponejibuwefugep.weebly.com/uploads/1/3/4/8/134879986/dunowivuwubi_fopowilupu_kafaxomufunonaf_xitiloxaxuku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_603b6900d60e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424010/normal_600d5c7f70e38.pdfIn PDF document text
    • https://jodegometokak.weebly.com/uploads/1/3/1/6/131606115/nawedoxebegire.pdfIn PDF document text
    • http://nesegejisivinu.medianewsonline.com/40164202503.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/138614b3-814b-4efd-a3aa-5a0a50941849/is_fantastic_beasts_a_prequel_to_harry_potter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b22a7a2-7211-4e87-8127-9ea3d1d46a10/wozawesapupakometodigesa.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_off0000cabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABE 5764 bytes
SHA-256: 45696fb4ff9b576d1dbd8ffe06242ff71a8479de65b18b1d44264559a6d7038a
font_01_sfnt_off0000de4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4B 10100 bytes
SHA-256: ce199f0f128552689a3cc3a8c6ab44d2cb352a689da432ad55f6b22f3267b5f7

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