Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac012bd393c2066…

MALICIOUS

PDF

67.6 KB Created: 2021-01-21 18:33:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a75b1543380d707573d0cd8cadbbdcaa SHA-1: b3ae0dc9b117187b22f73ba4f2580cee75202f91 SHA-256: aac012bd393c206659543ac30dd8bcea33098359443d32e8a9bb49eb1742e1b2
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating malicious intent. It contains a large number of external links, with a primary suspicious URL pointing to 'seumenha.ru'. The ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9155

Heuristics 4

  • 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
  • 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://seumenha.ru/aws?utm_term=dead+or+alive+6+pc+performance PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417670/normal_5fec864dad5ad.pdfIn PDF document text
    • https://sawepaxir.weebly.com/uploads/1/3/1/8/131858353/fe72ee41f35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480886/normal_5fda312600ac5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387050/normal_5ff310c015f26.pdfIn PDF document text
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/zonulefok-xofabawebe-nukunum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409113/normal_5fe6a2a03a170.pdfIn PDF document text
    • https://titumakusijuvap.weebly.com/uploads/1/3/4/3/134353199/b589f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/nutumevedoxidipa.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/jetevebofon.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/vixuragenubitawu.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/steps_in_data_analysis_in_research.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/english_sheets_for_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/snort_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/arkansas_department_of_education_special_education_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/cassavetes_on_cassavetes.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/zaburotunisuwalalosopu.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/active_learning_template_medication_digoxin.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/grilled_flank_steak_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/96586692121.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/votidoremoregejodogebu.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/48450897981.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/whatsapp_tracker_app_for_android.pdfIn 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_off0000f26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 5336 bytes
SHA-256: 8f601947e10572ca59c1a9ea9e9493c2b33927cee9a3a9fef7e73dd64cb6b497
font_01_sfnt_off00010487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10487 1944 bytes
SHA-256: 034c75d28b786bd5c9f922d5d78d7f825bf8fdd608b5f63c53657b79bd48c001

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