Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c9ddef1b2c818c…

MALICIOUS

PDF

107.1 KB Created: 2021-03-19 03:58:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ce24f38f58854edc0855858211e80186 SHA-1: a69cdaf984eba8e38e0c6ac72e1b0cd93afaa411 SHA-256: 39c9ddef1b2c818c8ff42fe999866870a744846384e47e758087aad0d82057ae
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were extracted, the heuristic firings and the sheer volume of suspicious URLs suggest a coordinated effort to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=sheryl+sandberg+commencement+speech+harvard PDF link annotation
    • https://cdn.sqhk.co/norowitidot/ijrjgXR/sudoku_easy_free_download.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/xabegukuxoniwod.pdfIn PDF document text
    • http://oneplusonemain.xyz/outlandish_aicha_video_songyrt7k.pdfIn PDF document text
    • http://lotto-investclub.com/91972171753c865r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455639/normal_602e303171174.pdfIn PDF document text
    • https://vukujaxirebes.weebly.com/uploads/1/3/4/1/134108713/nobovolazadefo_pujexa.pdfIn PDF document text
    • https://jalaxogazumin.weebly.com/uploads/1/3/4/3/134373329/jeloxuparazuti-sexolodebogeliv-nukujemetupakim-suganizokar.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/accounts_payable_notes_in_sap_fico.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374838/normal_60031ae4e1af3.pdfIn PDF document text
    • https://cdn.sqhk.co/sosexazefip/AggwwiT/gokox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_6051ed7f76185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427105/normal_5ffdeb3f4f739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_601cb1fc0235f.pdfIn PDF document text
    • https://mewasopaligesar.weebly.com/uploads/1/3/1/4/131454012/gakilimuxoza.pdfIn PDF document text
    • http://boxijogirexu.medianewsonline.com/twilight_book_cover_collection.pdfIn PDF document text
    • http://kisizifavo.getenjoyment.net/10590733324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384463/normal_5fd279c3f2f6c.pdfIn PDF document text
    • https://cdn.sqhk.co/fojufifef/ji4IDgo/12977750008.pdfIn PDF document text
    • https://wesaxewotivaf.weebly.com/uploads/1/3/4/5/134578523/vexanoxiza.pdfIn PDF document text
    • https://nefirekemoziwep.weebly.com/uploads/1/3/4/3/134332842/lalirolavarugun.pdfIn PDF document text
    • http://lighterusb24.site/clumsy_ninja_hack_android8gb8h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vidugozu.atwebpages.com/yoga_asanas_names_in_english.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_off000161d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D5 5892 bytes
SHA-256: 8d4fc6d6af7cc6481f77ff3d0e73b93e90ef17de9a8a559ebaef734f53178573
font_01_sfnt_off000175c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175C0 11640 bytes
SHA-256: cab843fbc20609fc0dfed31014a2639f2a96b6798d68ae9fe767d7aa19d33c09

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