Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb300ab27df2711…

MALICIOUS

PDF

72.0 KB Created: 2021-03-13 16:42:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1a558209c783d231babe3d52e8e0222 SHA-1: 93622f8529c86aa5aa4a36b26bb49ac7be2d7255 SHA-256: 0fb300ab27df2711ba65a5d51e10b4cf051f679dfcaac7a9b1595158971246f5
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, suggests a lure related to fishing equipment, which is then used to mask the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/aws?utm_term=fishing+rods+for+saltwater+and+freshwater
    • http://telovajov.medianewsonline.com/40939584209.pdf
    • http://lazirawolewok.getenjoyment.net/452292383.pdf
    • http://nosatines.mypressonline.com/28751985831.pdf
    • http://liwexun.mywebcommunity.org/gojatibidaxa.pdf
    • http://lozipazom.sportsontheweb.net/3282770491.pdf
    • https://cdn.sqhk.co/firijanab/hF5BjhN/53466487404.pdf
    • https://cdn.sqhk.co/vakanaju/jTjhiaK/healthcare_marketplace_login_trackid_sp-_006.pdf
    • http://dinewegivogofe.mygamesonline.org/agricultural_marketing_channels.pdf
    • http://kigirifaduguv.getenjoyment.net/european_art_history_timeline.pdf
    • http://ruxuzosok.mywebcommunity.org/what_is_critical_illness_insurance_with_aflac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dadupawo/29502577341.pdf
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_a6fe630c32ef44ec8282cd5bda334f82.pdf?index=true
    • http://sogivuwe.onlinewebshop.net/85101332155.pdf
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_df94d221c46d47b08433e77590031e4e.pdf?index=true
    • http://tivakifuzir.atwebpages.com/11327629896.pdf
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_c1e52d1b5245407ba488df598fa5215b.pdf?index=true
    • http://jotudokizer.onlinewebshop.net/dbpower_webcam_software.pdf
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_0f10dcde0ac64c41bdc6775dbe3a5e6a.pdf?index=true
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_f8c8014482a5491284357634b7d90de2.pdf?index=true
    • https://s3.amazonaws.com/muwomapotumugi/astm_d638.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db1a.bin
51443907053314e32a261f8a6bca62a01acfd1c351d5b5d32da0637edfe7b036		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 5216 bytes
font_01_sfnt_off0000ece9.bin
12fbf67e03d183de9881cb5c488ee5dc51d51465457339e7830609f7281add42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 10504 bytes

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