Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b574aa38c2e323f…

MALICIOUS

PDF

78.9 KB Created: 2020-12-30 09:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fd9a897c232732ed44e114310d6386a1 SHA-1: b463dc824a47059a8706ff3a232500e9f4dd9aef SHA-256: 3b574aa38c2e323ff72e295ced1273a77056605635d20849d64ea3fc506635ee
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting services and redirector URLs, indicating a link farm designed to lead users to malicious sites. Heuristics confirm the presence of malicious redirectors and link farms, and ClamAV detection further supports its malicious nature. While no scripts were extracted, the structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://cctraff.ru/strik?utm_term=surf+powerboat+racing In PDF document text
    • https://rekenapun.weebly.com/uploads/1/3/4/8/134851377/1157060.pdfIn PDF document text
    • https://nixofukotozawe.weebly.com/uploads/1/3/4/3/134313466/0861cd2.pdfIn PDF document text
    • https://loxutagunepolu.weebly.com/uploads/1/3/4/7/134763456/tidifujubebus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_5fb6d26697660.pdfIn PDF document text
    • https://cdn.sqhk.co/rejinujo/EHgjuo1/98866853306.pdfIn PDF document text
    • https://dujibirarikow.weebly.com/uploads/1/3/4/3/134321406/pavedilanuf-komexemiba.pdfIn PDF document text
    • https://cdn.sqhk.co/kukusagufo/iiijbia/38213192199.pdfIn PDF document text
    • https://vozutububedem.weebly.com/uploads/1/3/4/3/134372478/dafuji_tefunazonorowu_mutubifipimega.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://uploads.strikinglycdn.com/files/b9d5e64e-f3af-492e-a7d2-601d7e09625c/mefexuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c452f168-3128-4a76-b1b1-5929473a1882/the_economist_cancel_subscription_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76eff60-0823-453b-8ff2-00817a82a90e/47331587502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10f86b05-aefb-40c0-98c0-88aed751b9fb/vasowetiju.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/4699867498.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/guidewire_policycenter_documentation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7a0c952-ff43-4b5d-925e-631694020047/hyrule_warriors_gameplay.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_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 5188 bytes
SHA-256: 46bece112abc11a6b87adb7a2a14238d46c1f637a995ee53b141a6c55e3ead9b
font_01_sfnt_off0000fdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAB 10148 bytes
SHA-256: d7d462c368e390265deca0d48157e9af20203439a4c05086c563e7b9d29802b3
font_02_sfnt_off0001207f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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