Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d53e37b90bfe9d9…

MALICIOUS

PDF

76.0 KB Created: 2021-03-25 00:11:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c5488e05bd98e889ccd1a5c9d81fe21a SHA-1: 728fcf65efd2e7931f7fe2e58e75c517dbed0b43 SHA-256: 9d53e37b90bfe9d9f24b3c0edfe503d2fb5d5d9cc73a098ccfff536e79c347cb
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://leonvi.ru/wix?keyword=dry+curd+cottage+cheese+near+me PDF link annotation
    • https://cdn.sqhk.co/fapetemiji/hpJSchb/royal_caribbean_brochure_request_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxeromewime/Ljat9gf/numolafopul.pdfIn PDF document text
    • http://tatajosak.22web.org/employment_application_form._docx.pdfIn PDF document text
    • https://cdn.sqhk.co/lexuxeza/bhjicVJ/huey_freeman_boondocks_voice_actor.pdfIn PDF document text
    • http://samelike.site/babita_phogat_information_in_marathipfadc.pdfIn PDF document text
    • http://sberbank.link/579890863132t9g5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feliruxitekul.epizy.com/divesix.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/4384887473.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/xufaka.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/51583206914.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/makingsenseofcents_income_report.pdfIn PDF document text
    • http://turolikuzadera.epizy.com/android_tablayout_example_using_viewpager_and_fragments.pdfIn PDF document text
    • https://f7927488-8152-43cb-a667-e231f58cc5c5.filesusr.com/ugd/950cc9_d4fff130755a48d38bff493b51dc4a4f.pdf?index=trueIn PDF document text
    • https://5c06e36d-e6a7-492f-989e-88f86e9ca1b1.filesusr.com/ugd/c9ae65_09410f8cbdc24104bf2151753b98e617.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezutu/10647677495.pdfIn PDF document text
    • http://sabozovitebem.rf.gd/vesipor.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_off0000ed3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 5420 bytes
SHA-256: 2eefeeb1ded2548da20e4645ff22e03c399d8da4b6bf1324fb7e7107be62e01d
font_01_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 10232 bytes
SHA-256: 25ab5b14cf0e0964f300b4a4742baf89be7e8dccae5a280e66614339a17f5ca1

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