Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b771aee916f4054…

MALICIOUS

PDF

81.9 KB Created: 2021-04-01 09:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: deeac5eb1e6a0c2f8d3ec2bd0b35d6f9 SHA-1: 244d10fa4b6b0f5c611990703963661240579beb SHA-256: 9b771aee916f4054feb4a158c0ae6b42f6051d5da603658b51eacb6bdb9b7102
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are obfuscated or lead to suspicious domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document designed to lead users to harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://botokaw.ru/strik?utm_term=how+to+eject+a+stuck+disc+from+ps3
    • http://sadinexiwa.mygamesonline.org/leon_sur_les_accents.pdf
    • https://static.s123-cdn-static.com/uploads/4377933/normal_5fe36c3abdd26.pdf
    • http://muzibatixabu.mypressonline.com/modelo_economico_neoliberal_en_mexico.pdf
    • https://fibunijir.weebly.com/uploads/1/3/0/7/130740490/3133168.pdf
    • https://static.s123-cdn-static.com/uploads/4381289/normal_5fde8bc39bc02.pdf
    • https://cdn-cms.f-static.net/uploads/4369185/normal_600e597606f49.pdf
    • https://sulesebu.weebly.com/uploads/1/3/4/6/134634805/9511525.pdf
    • https://mojikusabuja.weebly.com/uploads/1/3/5/3/135301399/jiriti-noweriz-kononara.pdf
    • https://static.s123-cdn-static.com/uploads/4451212/normal_5fcf0c24a3cd3.pdf
    • https://static.s123-cdn-static.com/uploads/4373997/normal_5fef3f2d48153.pdf
    • https://popagupo.weebly.com/uploads/1/3/1/4/131407300/3c3bdc9e144058e.pdf
    • https://mamifamutimas.weebly.com/uploads/1/3/1/8/131871874/nuxide-zerusofeg-lorasobokofowel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/semuxemakaw/conjuntivitis_bacteriana.pdf
    • https://s3.amazonaws.com/vutame/bituwanimoxanadoladeke.pdf
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_ccca2698ff634c5ba47356250ee25893.pdf?index=true
    • https://s3.amazonaws.com/pisedij/datacontext_binding_relativesource_relativesource_templatedparent.pdf
    • http://wulibazosuxib.onlinewebshop.net/le_grand_livre_de_l_astronomie.pdf
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_a9209af44b54446ab652195434874cf0.pdf?index=true
    • http://sabixukavizom.myartsonline.com/what_is_the_difference_between_viral_and_bacterial_sore_throat.pdf
    • https://f8e303d0-f350-43d2-b7c3-f886ef13ec25.filesusr.com/ugd/1bb397_0f37ec69020f46eda0efce8289acd849.pdf?index=true
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_f6da9eead6b44301a03da60dbf5aae35.pdf?index=true
    • https://s3.amazonaws.com/fukepez/nazuwego.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_off0000ffa9.bin
8324cad3dd5350958123b038d4499174cc2f740c4c985789c01210f6bdf45f7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 5628 bytes
font_01_sfnt_off000112c9.bin
9b4cee8d3cdefc4d5b4c0c59445b1b59dd16dbe4d066f00774b13399a984c769		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 11664 bytes

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