Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce1ea8a3474f33d…

MALICIOUS

PDF

78.0 KB Created: 2021-03-28 00:19:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2f77f8939e529bf5c81178b1e1dde117 SHA-1: dc239ea4f61f4e2fc90405d7a6bf802ef7065a43 SHA-256: 6ce1ea8a3474f33dda20ed73ad8674843bfc9db6073b2559a6395a8717bdc1f2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or phish users. The embedded URLs and the heuristic firings like PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a search query, further supporting a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/award?keyword=beta+blockers+mechanism+of+action+pdf PDF link annotation
    • http://tiwimifozukimu.medianewsonline.com/minecraft_oeuf_bookshelf_door.pdfIn PDF document text
    • http://resapus.scienceontheweb.net/96093982559.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/33284090953.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/7477131.pdfIn PDF document text
    • https://watuluvijigu.weebly.com/uploads/1/3/3/9/133997483/1664062.pdfIn PDF document text
    • https://temizitukopisir.weebly.com/uploads/1/3/4/8/134898891/devirusiborowuxisuji.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/22495554612.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://37cc4ef3-276f-49d0-84f3-8bc08bbde6a9.filesusr.com/ugd/e4a5d4_0add014c4ec848d28321608e0368e750.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pegozegi/inglourious_basterds_full_movie_720p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b9bfb41-2a35-4799-8367-d3f4c16c09e1/lefadex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94fc2658-cd16-4d07-9136-0aaacc865d2e/how_to_adjust_temp_on_rheem_electric_water_heater.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/siwozoralidizabirizeve.pdfIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_4ec28f218e8649559c886b15d14f07fd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wekibik/estimation_worksheets_ks4.pdfIn PDF document text
    • http://fogokenum.onlinewebshop.net/functional_endoscopic_sinus_surgery_stammberger.pdfIn PDF document text
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_c1df000ee6e64dbab4142d7aeab5236c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b40e8e5d-2ed0-4fd1-9037-d998ff66e8e2/45208013228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d297b8d-cefe-4df7-9764-ad0cd3c7d006/how_to_play_cribbage_2_players.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/average_salary_of_ethical_hacker_in_canada.pdfIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_4e05d7c8b33b4dc2a2db38b541f239c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bf34265-d455-4f67-9df4-2a461477d8ed/9070928116.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69edfda8-f1e8-4b4a-84c8-82b3099e5b56/20237399957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f604d4f-c98c-4d1d-9328-56417b13e6b5/can_acrylic_paint_be_used_on_canvas.pdfIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_8e0833f3def94508bb853982d2e7da6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19f2a8ae-009e-4ec9-8dfb-baa8803beb85/pewojawagugeronege.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_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 5648 bytes
SHA-256: 8b20f70a89bf97a10a40f168403c0d9d709e3cc4c9b3535d606899df33055fab
font_01_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 10372 bytes
SHA-256: 5a28b26a8d01e10515f7d2a89e29f3ee632a9e523d248fa72c7b9622a570254d

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