Malicious PDF — malware analysis report

Static analysis result for SHA-256 99564f5a732ccda3…

MALICIOUS

PDF

70.6 KB Created: 2020-11-19 03:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 783e19d6dcce96965c8e8d29da4a6233 SHA-1: 09251f30e053d11e8e50ba8c1dc387fe40a0e52a SHA-256: 99564f5a732ccda3a896b6ddb5dbadc5ecca80b5616c0ecc8b55e59985476575
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with critical heuristics identifying them as belonging to a malicious redirector and a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary malicious URL identified is https://cctraff.ru/123?utm_term=eht+nature+reserve+swimming, which likely serves as a gateway to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/123?utm_term=eht+nature+reserve+swimming
    • https://ribapapa.weebly.com/uploads/1/3/4/4/134479292/fimapener_pekopikomut_wufifutekaxovo.pdf
    • https://cdn-cms.f-static.net/uploads/4417216/normal_5fb371493f444.pdf
    • https://cdn-cms.f-static.net/uploads/4401558/normal_5f942f1eb54fc.pdf
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/eeb5fb8094aa934.pdf
    • https://fuxamuwilemodo.weebly.com/uploads/1/3/4/4/134478429/f01bf97f341a.pdf
    • https://xijoxamapapi.weebly.com/uploads/1/3/4/3/134337958/sadopofabiwedo.pdf
    • https://duwelebizan.weebly.com/uploads/1/3/4/7/134701088/sozezabovewawel.pdf
    • https://buxiwizekekaxe.weebly.com/uploads/1/3/4/6/134662233/boxiralefem-tozevez-dokap-daxotu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zuwimadaneb/okuma_cnc_lathe_programming_manual.pdf
    • https://s3.amazonaws.com/gifojuxaxeva/temepusipojemekusevi.pdf
    • https://s3.amazonaws.com/wixatax/couper_une_page_en_2.pdf
    • https://uploads.strikinglycdn.com/files/2cfb69bc-e162-4575-92ff-b47c75e3de1c/zomilewidut.pdf
    • https://s3.amazonaws.com/fukezavazuj/56287883430.pdf
    • https://s3.amazonaws.com/sinamozagemoger/taber_s_medical_dictionary_free_download.pdf
    • https://s3.amazonaws.com/pexodugosa/historical_foundation_of_education.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_off0000d68b.bin
db4d7273ee9253a0495e7a6a297f4ad5aab5b6138f24195e5aeb81f78c328adf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD68B 5176 bytes
font_01_sfnt_off0000e817.bin
18be6ca9d3d31ce958ab07ee978c927e488f3a44048e2a405c031fa8b384c82e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE817 10540 bytes

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