Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3950cd60c0595ac…

MALICIOUS

PDF

72.2 KB Created: 2021-02-27 16:46:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dc7e0d5d290bcd949958167340caef11 SHA-1: 49d675125254adb43a2b348df77a01a0d334caa3 SHA-256: c3950cd60c0595ac1504c8fcb18249c189a2a62afd55563e0f06cbcba8be17a8
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link to known malicious infrastructure and a large link farm. The embedded URLs suggest an attempt to direct users to phishing or malware hosting sites. While no scripts were directly extracted, the PDF structure and embedded links strongly indicate a malicious intent to redirect users to external, potentially harmful, content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=devilbiss+pressure+washer+parts In PDF document text
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/1813309.pdfIn PDF document text
    • https://cdn.sqhk.co/gexopoku/icUhfps/never_gonna_give_you_up.pdfIn PDF document text
    • https://lasapiboxemifol.weebly.com/uploads/1/3/4/8/134865682/sevarogumisewor.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/mRiaMgd/11.pdfIn PDF document text
    • https://cdn.sqhk.co/raluzafa/dRidQm7/8594835105.pdfIn PDF document text
    • https://cdn.sqhk.co/vitikitema/haOUbab/kuxexo.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/pUizxgj/14522886750.pdfIn PDF document text
    • https://cdn.sqhk.co/tusadopovet/idSC4ie/vodiloba.pdfIn PDF document text
    • https://zemizipip.weebly.com/uploads/1/3/4/0/134098502/mewalalub-fobixe.pdfIn PDF document text
    • https://tumozoredupoki.weebly.com/uploads/1/3/0/9/130969837/4101371.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/jiwotarotavuz/bootstrap_template_for_contact_us_page.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/85403076112.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/europe_skies_violin_sheet_music.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_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 5196 bytes
SHA-256: 2d39d49ec2ea6500058ca47c4d04cfa7e64fa0dae7dc24d0141fdf39ebce67b8
font_01_sfnt_off0000efb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 10788 bytes
SHA-256: 52eb342e3053840705e8ed299a1a18f4383af4fc87999646fef772f25fcb7ad9

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