Malicious PDF — malware analysis report

Static analysis result for SHA-256 7564b84bbeb531c3…

MALICIOUS

PDF

72.3 KB Created: 2021-05-07 14:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a9149b93443611f88ccf128a25b6587e SHA-1: 7170078de175c69e1c1e8f13adf77e277acdcf00 SHA-256: 7564b84bbeb531c3b0f295bda4ea0ef2be12a8a75242ca4080a96d9887c1250f
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=fd130+terminal+paper PDF link annotation
    • http://itawegan.space/93198358245p1otj.pdfIn PDF document text
    • https://pikowezapuxo.weebly.com/uploads/1/3/2/6/132681044/vilowexizupib.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/4103157.pdfIn PDF document text
    • http://damvglaz0.xyz/mastering_environmental_science_answerszmwsx.pdfIn PDF document text
    • https://norotenivepele.weebly.com/uploads/1/3/4/0/134042349/sugalaxujede.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/pizazod.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/480231393.pdfIn PDF document text
    • http://xejosegapib.rf.gd/88012219745.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/senub.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/9948490300.pdfIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_d713625ba22f4116b9693b4f70833d2d.pdf?index=trueIn PDF document text
    • http://kowogipat.epizy.com/everything_i_know_about_love.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/kexepazoderafiwajuxisan.pdfIn PDF document text
    • http://jekogowe.epizy.com/panasonic_es-la63-s_arc4.pdfIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_d1311ce8d6ea4eeab4b9d2d2eaea7601.pdf?index=trueIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_d5357e2aac444611811627a26ddc37fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/hunter_hayes_wanted_piano_sheet_music.pdfIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_190b06e797c243598c27e1e5d554fc76.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8D 4920 bytes
SHA-256: 7db99e3fcffec784fd1de72e2ba52907e3c5043d6ed9571f3f7c0a5a04beeb76
font_01_sfnt_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 10968 bytes
SHA-256: 1a4dbbfdbc9fddb01d25050f570b372cc6da4de0e8400e6caa4036c5ec6e8739
font_02_sfnt_off0001049f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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