Malicious PDF — malware analysis report

Static analysis result for SHA-256 722a84e7a16117dd…

MALICIOUS

PDF

81.1 KB Created: 2021-03-23 09:24:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 974542822258be8dad7c8b7598084d08 SHA-1: 7110f2e8429f10bcd8f4c9c126287689f4a05312 SHA-256: 722a84e7a16117dd953a59c6d1d9fbc9082a42b2f7d16d7b6028f115c7396fce
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of an SEO spam or phishing campaign designed to drive traffic to malicious websites. The document body, though heavily obfuscated, references 'Norse mythology names for cats', likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=norse+mythology+names+for+cats
    • http://dokukuke.mypressonline.com/transport_business_plan_in_south_africa.pdf
    • http://xupulakikovuxo.mypressonline.com/nuwakotiramivirovanon.pdf
    • https://cdn-cms.f-static.net/uploads/4454541/normal_5fd1d2423712e.pdf
    • https://lupilonugugi.weebly.com/uploads/1/3/1/6/131637558/fujumesewe.pdf
    • https://cdn-cms.f-static.net/uploads/4487200/normal_603699f50b951.pdf
    • http://timinome.getenjoyment.net/64275302255.pdf
    • https://cdn-cms.f-static.net/uploads/4475588/normal_6025f8a2d1b4e.pdf
    • https://milajibejo.weebly.com/uploads/1/3/1/8/131871424/jadiresubipewonexumi.pdf
    • https://cdn-cms.f-static.net/uploads/4365626/normal_600c997652deb.pdf
    • https://static.s123-cdn-static.com/uploads/4502178/normal_5fca0c512510f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nuluwajewugutik.onlinewebshop.net/uniben_admission_list_2020_19.pdf
    • https://s3.amazonaws.com/werowibovezoje/alimentacion_consciente_libro.pdf
    • https://4407eba0-147d-4e9d-98ff-19010b67f466.filesusr.com/ugd/c1f2fd_6b3c7270d6e149ba9bd518d6684cae88.pdf?index=true
    • https://s3.amazonaws.com/midizaxopazeji/55570503196.pdf
    • https://s3.amazonaws.com/fadobirak/gangs_of_new_york_parents_guide.pdf
    • https://s3.amazonaws.com/nolarifaforuxop/blog_template_wordpress_plugin.pdf
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_163a6792ae9140cbb6ccf7a5f42c818b.pdf?index=true
    • 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_off0001022b.bin
4e56c6e3e128848ac9ab6a14c2a861aa2fbfbc61bfe5264a63b36fb320efb355		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 5368 bytes
font_01_sfnt_off00011452.bin
0656bf2920506214b204e9a453dda2afd3c80140a35b11b4b54b933d1ff71efb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11452 10372 bytes

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