Malicious PDF — malware analysis report

Static analysis result for SHA-256 5753c59c66cae6f1…

MALICIOUS

PDF

82.8 KB Created: 2020-11-16 22:15:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ff9143436e202d7a12064de79aeceda5 SHA-1: a75a5f52277469d0f2513a71a2783dd112768205 SHA-256: 5753c59c66cae6f16005fea06089257c956f65e356969bbba5edd3aa5e0ea9db
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' reveals the presence of numerous external links, with one pointing to 'https://s3.amazonaws.com/bodajaku/49311554697.pdf', suggesting a link farm or SEO abuse tactic. Another external URI, 'https://trafftec.ru/123?utm_term=four+mirror+armor', was also extracted. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection attempt.

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
  • 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://trafftec.ru/123?utm_term=four+mirror+armor PDF link annotation
    • https://juwememuju.weebly.com/uploads/1/3/4/5/134523402/48c1c5caf.pdfIn PDF document text
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/9608928.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bodajaku/49311554697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad46243-a674-4ec6-8365-034e6d6eebcc/beyblade_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c713543-ce83-418e-9bfd-7f9fda0b0e05/morogosezurasosotezizeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4128c92-9f17-4c4d-b094-4c32c7dfac20/what_is_communication_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c1612b2-93e7-4815-93dc-3f95d9a9b08a/11056504215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43562e3-8ee4-4c86-9383-55802e06919a/40x_escape_walkthrough_24.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8433d632-6cf2-4f09-b3f6-a70ecad4e435/the_only_sales_guide_youll_ever_need.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9291575d-d80f-42b8-ab99-31b2e21c4c4c/bupoziwilupefuk.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/32603319181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5cea89f-d48a-444d-b348-e90285158382/95579898059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac1501e-4f4b-4c9c-8447-75731a76e0fa/80480805876.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_off0000db11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 3756 bytes
SHA-256: 59bce99aa609b4e1de90f329cd7cb6a4dbf11337c645ba3a628a13204d0e5c4d
font_01_sfnt_off0000e868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 4576 bytes
SHA-256: 9a67f634310559172abaabfc6d2f0e05704fd2ef67178b7830f531a21f388e8d
font_02_sfnt_off0000f7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DB 14584 bytes
SHA-256: e6cdf5e5c21e7200015b3475dbe87eabc894394575c2b32735e4fda7a75cd543
font_03_sfnt_off0001263d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263D 16844 bytes
SHA-256: e1bbb1d8f14e47633cdcd6c4aa8a1768e59418c42e8bd2110020564d32a8292e

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