Malicious PDF — malware analysis report

Static analysis result for SHA-256 088e78ca4ef15b3e…

MALICIOUS

PDF

78.8 KB Created: 2021-03-28 12:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eba97ac21e214e6fa81a4278492a6649 SHA-1: fd0eae3280997a28192f8139088d9542f8c432bd SHA-256: 088e78ca4ef15b3e0402a84278ac321516667825c2a3d78f2cde78a9dc9dc9d0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded URLs. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

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://pelibifir.ru/wix?keyword=antiderivative+word+problems+worksheet
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/bofokemunipiwof.pdf
    • http://rorixuge.iblogger.org/business_model_generation_alexander_osterwalder.pdf
    • https://niweduval.weebly.com/uploads/1/3/4/3/134349673/bixukid-jenire.pdf
    • http://kodesurajevo.iblogger.org/define_allotropic_form_of_carbon.pdf
    • http://fejugutafilevin.scienceontheweb.net/67170047728.pdf
    • http://delabozaxexiris.getenjoyment.net/pozetejepenurevapiti.pdf
    • https://mowazaxof.weebly.com/uploads/1/3/4/7/134704653/f3352.pdf
    • https://xebuzoxovekig.weebly.com/uploads/1/3/4/0/134018553/7af1443737.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7284709c-45e9-4d55-a6cd-8fe8332b8c40/ravezevojuti.pdf
    • https://uploads.strikinglycdn.com/files/5fbad350-cd25-49a9-96d3-df3f0c7e6a59/43697594755.pdf
    • https://uploads.strikinglycdn.com/files/79b50601-8843-4c70-aea0-5b599536be22/sebugunusopunopojavosiz.pdf
    • https://uploads.strikinglycdn.com/files/edd5b7dc-1a6c-44df-ab28-ea86a870f1f3/how_to_use_hisense_aircon_remote.pdf
    • https://uploads.strikinglycdn.com/files/5d946697-d1c4-4953-900d-05ee4fedb946/does_james_allen_use_lab_made_diamonds.pdf
    • https://uploads.strikinglycdn.com/files/adc542b4-5c8a-4abe-a294-a86d99f95d6d/what_is_mathematical_equation.pdf
    • http://zutadefado.epizy.com/tupowojagovadibod.pdf
    • https://uploads.strikinglycdn.com/files/e08f2059-e1d4-4147-a5c0-a679228809c5/28389244326.pdf
    • http://pumeluwona.epizy.com/age_of_empires_2_soundtrack.pdf
    • https://uploads.strikinglycdn.com/files/5e380810-1f0b-4c17-b0e0-87431ec2e35a/larewigaxub.pdf
    • https://uploads.strikinglycdn.com/files/282a5d54-f2e6-4033-800a-fc0c3fd14feb/pisenelewotapekazigixeloz.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_off0000f28f.bin
063ba90038a64ff7db1cf87aac9173b06239b012354e8725ff5d6346398f2401		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 5544 bytes
font_01_sfnt_off00010549.bin
3f6a86a6201132ba3dddab0683d807a62ab6651691d276b05a313c502659f46a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10549 11896 bytes

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