Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5868780c5cc32fd…

MALICIOUS

PDF

88.2 KB Created: 2021-03-27 09:55:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e9b523b4f58b9dcf8f10b48769f7b930 SHA-1: f1c47e1883c7c460140a7c691568926c5d8e3b5a SHA-256: a5868780c5cc32fd1850ae6c55aa39826ba17fa52e3f0eec98701c884a73a68f
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with the primary one being a lure for a specific book search. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to distribute further payloads or phish users. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/award?keyword=aristotle+the+art+of+rhetoric+pdf PDF link annotation
    • http://rokuboxajiga.medianewsonline.com/betaseleb.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/99187425117.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413693/normal_5fde5376cc3de.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/mjhfji5/70246449034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386609/normal_60296874081b2.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/iAbAb6m/video_player_vlc_media_player.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxoporerom/9gegcq1/best_graffiti_masterpieces.pdfIn PDF document text
    • http://gepopusoka.mypressonline.com/carbonium_ion_rearrangement.pdfIn PDF document text
    • https://cdn.sqhk.co/sogunixe/XVRgghi/tunono.pdfIn PDF document text
    • http://lomuwugevona.getenjoyment.net/assyrian_history.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/SJygi2E/jagaxapipipixisigivi.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/nelejoxakaso.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_7b3c4f2af6fd422989621925930279c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/037c712c-dee0-4e94-87b9-009175bff6b9/64682589089.pdfIn PDF document text
    • http://bajekixizosi.myartsonline.com/zizetarovalixe.pdfIn PDF document text
    • http://nokejufesuw.atwebpages.com/bagupogod.pdfIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_76b7b16da4c043a9af548a95c2193e1f.pdf?index=trueIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_671ed850b9834069a455176421e12af6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55f5b84b-fcfd-40d2-86c5-02592ec3bdb9/watch_the_count_of_monte_cristo_online_free_123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb6cd1ac-faca-400f-8583-63de11ba4140/rotutowigesevamuke.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
stream_005_off0001267a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1267A 15240 bytes
SHA-256: 4b9b92709ec29bc625218cf1d33a8cdec14e4988336e2fa8ed97992879573dfe
font_00_sfnt_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 5232 bytes
SHA-256: 92be4a0535f9c9617ea562401f84f21a0ebe9761009cca298057381161cc9647
font_01_sfnt_off000100e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 10948 bytes
SHA-256: 8750877637ded489e493c5b06357831390f34ef3300c31f3254879270d4750d9

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