Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3d1ab392c8e13a…

MALICIOUS

PDF

89.2 KB Created: 2021-01-03 20:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f2e68195d8eb16f65617d47f38d9a071 SHA-1: 9e3651c6146a48dd29957164bcc60a46d64fd9cb SHA-256: 8e3d1ab392c8e13a3e46257a953076b7911744120b275b4bed855cd0382adee3
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links to external resources, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong likelihood of malicious intent, aiming to lure users to potentially harmful sites. The ML classifier and ClamAV detection further support this assessment, classifying the file as malicious phishing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://cctraff.ru/123?utm_term=casos+de+factorizacion+de+polinomios In PDF document text
    • https://cdn.sqhk.co/pevejotomoma/gcmf4Yx/bitupafigofavas.pdfIn PDF document text
    • https://cdn.sqhk.co/zokoxirinuz/jg756jh/rilazamumilukofamuzir.pdfIn PDF document text
    • https://mefopati.weebly.com/uploads/1/3/4/8/134866381/420366.pdfIn PDF document text
    • https://cdn.sqhk.co/sixojifez/nZwWcje/parent_plus_portal_rediker.pdfIn PDF document text
    • https://bexenexitefixu.weebly.com/uploads/1/3/4/7/134725849/896989c90d05.pdfIn PDF document text
    • https://cdn.sqhk.co/mumoragato/rfgcjhX/wutumuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec195bc0-9dc5-476b-afea-76a05ca6b02e/90317498144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ffeff2-279f-40af-9c67-ae2fa4065ae8/could_not_detect_rake_tasks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5747623-1e89-44fd-8085-65a96f737fc4/diwukogara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a97fc404-898e-4afd-8f66-f4a9c52b90a4/sotavigegowexejapovipo.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/full_bed_sheets_dimensions.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
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF300 5256 bytes
SHA-256: ef9e0b8bf6b2ebb237e0bf5b71c7448b55cbeb90d07be1e8f6d919119c5ddb48
font_01_sfnt_off000104d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 8976 bytes
SHA-256: 043275fd08f61a242a3987e2d5cd46ead7ad3b0856b8812769e4fb4fd1355f22
font_02_sfnt_off00011696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 13064 bytes
SHA-256: 52f86ee4a8643515eacc666a5479643f4dc99d161c12604c77fb8958693caed7
font_03_sfnt_off0001410b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410B 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833

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