Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a758d05318d408f…

MALICIOUS

PDF

74.2 KB Created: 2020-11-16 13:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 39cbb40bea13a1f620a951fac0ebb8b0 SHA-1: 9093109e617d57f6ec801add54f6e5f6f9873204 SHA-256: 3a758d05318d408f37c74bed95c7f54cb93367ed6aed4f792f31713fa0db8009
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

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 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://traffmen.ru/123?utm_term=todos+los+corazones+son+uno+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393033/normal_5f934f0b8fc68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458615/normal_5faa0059890ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5f97ebe63c51e.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/7082916.pdfIn PDF document text
    • https://bisudika.weebly.com/uploads/1/3/4/3/134366448/91809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f883f4f38697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413000/normal_5fa42e9cad333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f89323c66257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_5f9270e9bfe70.pdfIn PDF document text
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/mezaj_tinuzujoni_biniguk.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/50763808-05a3-484b-8a08-2acf0b6ac477/nalisifurobanen.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/41372883466.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/rezivena.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/pomumegi.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/video_burung_cendrawasih_menari.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07B 4904 bytes
SHA-256: d36dd19335c66a800c3f2942badc5cd0c5c6161d2f578ccfe760a518a8ce15f9
font_01_sfnt_off0000d134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD134 11516 bytes
SHA-256: b06e3ead06e976a17f04616f939721acc569ad4478b07f066615e2b23487b4b5
font_02_sfnt_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off00010bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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