Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f98d51a628c81c4…

MALICIOUS

PDF

71.8 KB Created: 2021-01-06 20:32:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9b5a817b6d638a7075204bd1f65e5df2 SHA-1: 8b8f0ffaa5664cee0c221aa767574065dd33e7c5 SHA-256: 5f98d51a628c81c4d3d6741060695080b7742f04dd283f59008e0be0aa3f3a65
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffi.ru/aws?utm_term=acdc+ringtones+for+android+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480182/normal_5fe0b8ca1f120.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/8shfwgh/lomezamodunusedopez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410020/normal_5fe52feb39cf2.pdfIn PDF document text
    • https://gamidamivagug.weebly.com/uploads/1/3/5/3/135324690/3933957.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/20cef91d55d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/936ca84a-1094-443a-9d2a-997de48ee12a/59801157673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6fafdf0-21d5-45e7-bd30-f857c955c0a7/juegos_psp_cso_mega_1_link.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e31730d7-e988-4942-8b06-62232b89786e/36307949929.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/revirumomum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba3df3a-e935-4d75-800c-b5b093a0ef88/fokiporekojuposegum.pdfIn PDF document text
    • https://s3.amazonaws.com/gajejasa/uac_shelter_in_miami_dade_county.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc61859-2675-4538-9a36-4dee9d3f1716/the_jazz_piano_book_mark_levine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7c0a4d1-6b55-40ba-8139-1de68fa7ff7b/10830932536.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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 5144 bytes
SHA-256: 268445e3e44556fbb3be87ba7b1dc8455b39a8b2a3a0b3412507db1f26761f89
font_01_sfnt_off0000ec89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 11208 bytes
SHA-256: a243609b9785efc6eaf0f621e000cf981773327e381a78b5474b611fadb3b96e

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