Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ffd65c7c79fceb2…

MALICIOUS

PDF

76.9 KB Created: 2021-02-26 05:16:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8b981b777b099048b47b196f5bc5a578 SHA-1: 52dd23eb5b045d1061230efb96eada8ab642aff5 SHA-256: 2ffd65c7c79fceb2bf8f856e3dc2324640230784c284adde32e41ed2babe5d76
186 Risk Score

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 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://jottigo.ru/strik?utm_term=black+and+decker+drill+charger+14.4v PDF link annotation
    • https://cdn.sqhk.co/famuxina/kdNjbyv/pikenimedirigoxoja.pdfIn PDF document text
    • https://gasodugolulo.weebly.com/uploads/1/3/4/3/134375537/gobave_rolafijed_pukap_mamotamonusezi.pdfIn PDF document text
    • https://lekibuwowobaveg.weebly.com/uploads/1/3/5/2/135295955/vemel-ruwuxesog-jezezufurin-pukodomelib.pdfIn PDF document text
    • https://cdn.sqhk.co/pabopimi/ft5jehc/ruvut.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/53241781039.pdfIn PDF document text
    • https://cdn.sqhk.co/gutemokerezo/jfTgcJE/709887653.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/cgghhSY/tabivizexubutubape.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/aboYkhd/72619809976.pdfIn PDF document text
    • http://telgrm.site/lajiwofoworusimapai6ol.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/bazuresi.pdfIn PDF document text
    • https://fikejibin.weebly.com/uploads/1/3/4/3/134331262/xiwanasaluga.pdfIn PDF document text
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/6095276.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/177891d1a8b0f8c.pdfIn PDF document text
    • https://tatazopizen.weebly.com/uploads/1/3/1/1/131163492/zipitemek_voxoxakalugavu_golirubiripuse_sutenikovebul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zesafemumibow.myartsonline.com/online_electrical_engineering_bachelors_degree.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_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 5368 bytes
SHA-256: b79fc744b2cec1eebc25c6790d3cc92ae999fb3b24add9d2aa98f0c3c9ca1fbe
font_01_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 10960 bytes
SHA-256: 5bd8941558c6d0e8304b4bdbbb2cfd0012d505fa15ec9e87b3cbd96ab7d319d9

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