Malicious PDF — malware analysis report

Static analysis result for SHA-256 645b45e5cfbf8893…

MALICIOUS

PDF

82.7 KB Created: 2021-03-22 01:08:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f791f50da4af0dd35bc6713cf0678ed0 SHA-1: dd61171579e253a0ad8863e7d80d6d48f649d0d9 SHA-256: 645b45e5cfbf8893691a2f4b127e2ac22bd93eb0c78cb2b0575335931686b78e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded URLs that redirect to various websites, including one that appears to be a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the 'link farm' heuristic suggest the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/wix?keyword=all+legendary+pokemon+in+alpha+sapphire PDF link annotation
    • https://cdn.sqhk.co/gulanuwe/icicifE/smashing_the_glass_jewish_wedding_blog.pdfIn PDF document text
    • http://zovizakuxefo.iblogger.org/3666805247.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424689/normal_5fdf735cece2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464702/normal_600574dd0f18f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500878/normal_5ffbe8c71a4d6.pdfIn PDF document text
    • https://cdn.sqhk.co/lokutibu/7wHLije/7414163804.pdfIn PDF document text
    • https://cdn.sqhk.co/melalisopapu/O5nBhjO/40715189152.pdfIn PDF document text
    • https://cdn.sqhk.co/wikelere/00s6kW8/1540969817.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lejemerane.epizy.com/fepepilebodabunuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27db994e-dd65-4ffe-80ca-cca132cc7a3b/best_songs_80s_90s_remix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd14e1b9-4ec1-4914-89b1-a61bb35a4613/83492215740.pdfIn PDF document text
    • http://wosunitiguzivef.epizy.com/42769219912.pdfIn PDF document text
    • http://wosotufozutula.epizy.com/vesevezexoparad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faf53102-b5cc-4d90-bad6-3d9c5f5b3214/cuantos_metros_tiene_un_decametro_cuadrado.pdfIn PDF document text
    • http://sutijipekopavob.rf.gd/bosch_axxis_washer_laundry_detergent.pdfIn PDF document text
    • http://gorumefu.rf.gd/origami_cranes_step_by_step.pdfIn PDF document text
    • http://setiwol.epizy.com/dinobapejebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7b80afc-9e41-4837-af67-399389eb3c7a/windows_10_s_upgrade_to_pro_free.pdfIn PDF document text
    • http://zifovusadenu.rf.gd/40389878443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24310f89-468c-4144-8822-bae301aac1a5/kamubo.pdfIn PDF document text
    • http://nemojasa.epizy.com/cyberpower_1500va_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d0c8549-2b64-43a4-95bc-68651f087030/black_and_decker_toaster_oven_cleaning_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a472d2d-1e61-4c9f-ab9f-8e99fdeb69c3/dragons_dogma_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/224ea80c-2f95-4d8d-a367-9661aca0eb22/letter_from_birmingham_jail_analysis.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_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 5528 bytes
SHA-256: 4a127a1f3362c05360640ec5e8dc2dce31d173e41fa3f39aa5b24a6bd745f3c4
font_01_sfnt_off0001177e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177E 10396 bytes
SHA-256: 2f16da14d267a1504552fd2f9e6f2113077247c34b5d123d3928bf03a79e06bb

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