Malicious PDF — malware analysis report

Static analysis result for SHA-256 43696ace2249976c…

MALICIOUS

PDF

66.6 KB Created: 2020-11-25 07:09:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 11efd3c5b8ad176797e8bcc140e67849 SHA-1: b94157b25031e94ff657f9f1d49d2040463f3400 SHA-256: 43696ace2249976c8e9029c31865af3148646fd03d67413fdb6ba26915e51502
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The sample is a PDF document that employs social engineering tactics to trick users into installing malicious browser extensions or updates. It leverages a lure related to viewing content, which is a common phishing technique. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely to facilitate further compromise or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://trafftec.ru/aws?utm_term=google+chrome+apk+version+history PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450641/normal_5f9fbc155d837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_5f953bed943da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448345/normal_5f9eaa218beb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_5fb6b5172ea1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495681/normal_5fb42a363fb2f.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/86139ca3-72a7-4836-9e2b-b61b0c6c656e/30119395339.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/86756688265.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/11000925619.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/vonezot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/697eea19-ff6f-4dce-b4dc-616859a1eeb7/wobanoxafipu.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/medical_report_of_a_blood_cancer_patient.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/647af7fd-faca-4295-8c63-a6cb86d6bb69/lotos_lt5000d_plasma_cutter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66884f57-aab7-426c-b6ad-865fd0aa57e3/zirowakadak.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_off0000c6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B3 5604 bytes
SHA-256: ae8893530b6008e92365a650821cbfe6d46f6269dbb997feae14d3ae1df3ac53
font_01_sfnt_off0000d9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 10592 bytes
SHA-256: cec6ba2c53b129fd2fb78d7f2ac98a30c685b1ed8adb71fc063367ec877df630

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