Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ddad33530a830c…

MALICIOUS

PDF

95.2 KB Created: 2021-03-10 08:05:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0bb9edb2c5a8bae5d378ca3b658ac747 SHA-1: 22ab08f8ae12748234d50e71c8d9556a314ef4f9 SHA-256: a8ddad33530a830cddacc4dc2306b768ab0f97aabfdd6f7e51b8bbbd9ae66433
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a theme related to 'The Cask of Amontillado' to deceive the user into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://midufefew.ru/award?keyword=the+cask+of+amontillado+pdf+edgar+allan+poe PDF link annotation
    • http://ravovenovibu.medianewsonline.com/the_communist_manifesto_book_pages.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407782/normal_6002c9cc58dfc.pdfIn PDF document text
    • https://cdn.sqhk.co/ronuwimo/wjjQieL/truth_or_dare_trailer_full_movie_2019.pdfIn PDF document text
    • http://vuwefedope.sportsontheweb.net/what_are_the_essential_characteristics_of_feudal_society.pdfIn PDF document text
    • https://cdn.sqhk.co/puvalonu/Chaijjg/zalimumewujukovu.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/fidWhdp/57615828355.pdfIn PDF document text
    • http://jerunuju.mypressonline.com/vikujizutu.pdfIn PDF document text
    • http://tonukavugu.mygamesonline.org/titofakup.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/ijhcuWS/does_rally_s_delivery.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/cCiaiaV/23518805493.pdfIn PDF document text
    • http://takaweri.mywebcommunity.org/27547492708.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/hbAhfFr/95162089930.pdfIn PDF document text
    • https://cdn.sqhk.co/wemupaxuziv/NE2Qhik/3649539351.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/monitorear_red_wifi_windows_10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459060/normal_60055da56d981.pdfIn PDF document text
    • http://xilibinebosapeg.mywebcommunity.org/tony_evans_bible_commentary.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/ninudo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447434/normal_602b533cb56f7.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/b98b75e1-60a9-464d-aef1-1a9fd01d535d/16540727696.pdfIn PDF document text
    • http://kuxoxokazutuv.myartsonline.com/17831666087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/badf20c5-8e02-4164-aef6-838defdab5ae/kidogaxafidawob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d63f5f7-9d2b-4aa1-96d9-7ca199e45622/farerokasadopevero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d097fa59-3a46-410e-914f-98e8098172cb/what_does_plot_diagram_mean.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_off00013846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13846 5584 bytes
SHA-256: 25502427a03b44ed2fcdd2dc5f33ae001c0f9f4f79f9ab1acc4532db86a4c985
font_01_sfnt_off00014b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1A 10552 bytes
SHA-256: 096add7857069089a2adbd25ea3427a60afe35e8f554e80e02fdae818f62db7d

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