Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5ba449edb43fe4…

MALICIOUS

PDF

68.1 KB Created: 2021-01-11 23:08:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 98a4760aaeb28e98408349960971b767 SHA-1: 946795b9205e628ffac83e5609e3c26f107c5cc2 SHA-256: 5f5ba449edb43fe4eb2167025831807a6891292aaeff7fba7b3db70b9b826649
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The document appears to be a link farm, with numerous embedded URLs pointing to disposable hosting, likely designed to redirect users to malicious sites. No scripts were extracted from this sample.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/wb?keyword=desert%20temple%20escape%20walkthrough In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_5f978411cb9af.pdfIn PDF document text
    • https://site-1176918.mozfiles.com/files/1176918/bizexunovozupurilur.pdfIn PDF document text
    • https://jetufebarivoma.weebly.com/uploads/1/3/4/7/134703916/56b3a1cb11af75b.pdfIn PDF document text
    • https://site-1175150.mozfiles.com/files/1175150/95891893641.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463791/normal_5fefdb20b9dbd.pdfIn PDF document text
    • https://ziluxokoker.weebly.com/uploads/1/3/4/3/134392919/1714858.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417983/normal_5fc88b4a3ffa8.pdfIn PDF document text
    • https://gilabekavug.weebly.com/uploads/1/3/4/5/134597011/d9c8b190452aff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452385/normal_5fdab985b7694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_5f876686477a8.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/nademopor/diwegadogogujivupanajabo.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_off0000ccdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDB 5500 bytes
SHA-256: eb067cbc1e6f531adfdf8db140a007c5c5e9f6ac0edf1f1fd074b774f7634748
font_01_sfnt_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 10660 bytes
SHA-256: 1daf5de798381efbb35eff621bb4bf21a6987baac2657240baf071f23d2f6913

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