Malicious PDF — malware analysis report

Static analysis result for SHA-256 346bed845a48612e…

MALICIOUS

PDF

68.8 KB Created: 2021-02-01 08:00:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2ab08e94c3fd6d2bed13d0b30d8f602d SHA-1: 6012aa5bd81e6c11a690a1fb7430de0b62d5debb SHA-256: 346bed845a48612e5f1baf769a800fd0ff87b3c8e0c81042e38c7505d3fb54a1
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the embedded links suggests an intent to redirect the user to malicious content, likely for credential harvesting or further payload delivery.

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://crophysi.ru/wb?keyword=hybrid%20sim%20slot%20meaning%20in%20marathi In PDF document text
    • http://jujiwaneko.iblogger.org/hygroma_colli_adalah.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5fd6916cce624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_5fe705655a721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495841/normal_5fd61bd652d16.pdfIn PDF document text
    • http://copyright-notice-ig.com/adam_smith_theory_moral_sentiments34klt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zukisofom.epizy.com/98598038936.pdfIn PDF document text
    • http://kijaripejugap.epizy.com/35481742746.pdfIn PDF document text
    • http://buwozefavimim.epizy.com/arrest_reports_athens_al.pdfIn PDF document text
    • http://bomigezi.epizy.com/string._format_iformatprovider_example.pdfIn PDF document text
    • http://jolavewavesuj.epizy.com/vozepowanebasixu.pdfIn PDF document text
    • http://lemujiv.epizy.com/refraction_ray_diagram_worksheet.pdfIn PDF document text
    • http://kupavojos.epizy.com/lagu_carabao_made_in_thailand.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_off0000cff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF3 5444 bytes
SHA-256: a56ab22f3d0c32e3c8b198c66e03658abcc37349919e9a094d40ffa456e15c9e
font_01_sfnt_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 10692 bytes
SHA-256: 620f1f80482affc3cfc21380482a73e072de53d44a77cb62026a63f2aa0c8f48

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