Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f28630fcc0cb28…

MALICIOUS

PDF

81.2 KB Created: 2021-02-18 22:14:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 626662e736a464c7befb4616f1d06d65 SHA-1: 769efc68082ef4bacd3239e568cdb7ccf62e65e3 SHA-256: b4f28630fcc0cb28ede31c340f08bdd30b5ca92d28a3c3a6c9874aa1d195918d
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 0.9997

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://crophysi.ru/wix?keyword=tiny+house+design+and+construction+guide+free+pdf PDF link annotation
    • https://petirinupupa.weebly.com/uploads/1/3/1/4/131438611/misixexebafoxi_fixepesexuxun.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/c8jcVgc/90186719792.pdfIn PDF document text
    • https://cdn.sqhk.co/venitalobeni/szjejjB/tropico_4_mission_7.pdfIn PDF document text
    • https://xiruzavaxukegaf.weebly.com/uploads/1/3/5/3/135324830/mesewakevoz.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/fogibi/19217680840.pdfIn PDF document text
    • http://rekipefivikupa.rf.gd/beneath_this_man_espaol.pdfIn PDF document text
    • http://wuzuruwevirelu.rf.gd/dateronadode.pdfIn PDF document text
    • http://rojuzejuleg.rf.gd/44030201595.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/chakram_ringtones_free.pdfIn PDF document text
    • http://bunisanabasa.epizy.com/bidomevixagixo.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/janomokolil.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/annexure_111_form_6_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/acute_viral_sinusitis_treatment_guidelines.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 5316 bytes
SHA-256: 3602eb67ea887aef8d14c4fd4e9ff037e1102597df1ea676c17af789ce046c8d
font_01_sfnt_off00010364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 11300 bytes
SHA-256: 0cb60f45eaf42b824bc52a2e1673d771ba1ef13d341d5a33249e027a59ddeb25
font_02_sfnt_off0001293a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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