Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0beca90586dc889…

MALICIOUS

PDF

69.3 KB Created: 2021-02-18 05:06:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 23b18984d961fa03e7c41efe4d599514 SHA-1: 936252d81bcfb109a3d6533ff6eba7858685f7d0 SHA-256: d0beca90586dc889ef261d852b954d7f8fb06a45f287120c756292b7cd5cba40
184 Risk Score

Malware Insights

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

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 and routes users through malicious redirector infrastructure. 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/wix?keyword=honeywell+th4110d1007+pro+24v+digital+thermostat+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_60125fb846b41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458132/normal_5ff01e03b4017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408879/normal_600e40b371383.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451374/normal_5ff91faa11014.pdfIn PDF document text
    • http://podorokufexapal.iblogger.org/brutal_type_bold_font_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454042/normal_5fd16e5af22d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527902/normal_5fd6e3320f7d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420930/normal_5ffb84c8b6814.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/juzowilipi/temumexul.pdfIn PDF document text
    • http://pebotavafusu.epizy.com/kuberejopera.pdfIn PDF document text
    • http://joveviziw.epizy.com/ncis_new_orleans_episode_guide_imdb.pdfIn PDF document text
    • http://zosonigileg.rf.gd/software_project_feasibility_study_template.pdfIn PDF document text
    • http://topowurarasixe.epizy.com/nypd_police_accident_report_overlay.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/78660587514.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_off0000d10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10B 6080 bytes
SHA-256: bcadb629d2603a2e972d63ed9f171be89c6d506bce4681d980de6ee17adea0fc
font_01_sfnt_off0000e5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BF 10032 bytes
SHA-256: 9c9db13d53b61247400fd588eea5a75ef2eea2950a049a357467a646b5ac7561