Malicious PDF — malware analysis report

Static analysis result for SHA-256 558d0d1e7110cf6f…

MALICIOUS

PDF

70.7 KB Created: 2021-06-15 13:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 14f7372e8bcad8ce44b6dd8f6635955c SHA-1: b3ef22bcf0ddb509c4aed7c2eee00cfa591b55de SHA-256: 558d0d1e7110cf6f00a822cc1f8116978842bd7b6b98d45eadcc26f669381ac5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or to download further malware, aligning with the characteristics of a spearphishing attachment.

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://nomylo.ru/pbw?utm_term=the+little+mermaid+2+game PDF link annotation
    • https://vakikuxikedeti.weebly.com/uploads/1/3/5/3/135320305/6716980.pdfIn PDF document text
    • https://buwuxebukiz.weebly.com/uploads/1/3/1/6/131606134/2333632.pdfIn PDF document text
    • https://dedotomonifagax.weebly.com/uploads/1/3/1/6/131606429/pisele_suruxobuwaji.pdfIn PDF document text
    • https://wegetafa.weebly.com/uploads/1/3/0/9/130969448/pelosa.pdfIn PDF document text
    • https://kogozodibivuf.weebly.com/uploads/1/3/6/0/136094397/456e22404fda2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408711/normal_5fd665402d332.pdfIn PDF document text
    • https://bulasenojagaroj.weebly.com/uploads/1/3/4/3/134357248/rowug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487935/normal_5fda917521df5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452157/normal_6068792762982.pdfIn PDF document text
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/zevap.pdfIn PDF document text
    • https://gedenotovet.weebly.com/uploads/1/3/1/3/131379555/fitegibeto.pdfIn PDF document text
    • https://rogozinigaki.weebly.com/uploads/1/3/7/5/137516336/kozuxiv_kusezuti.pdfIn PDF document text
    • https://lotigasi.weebly.com/uploads/1/3/4/7/134705720/gedudevasozujawer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://didaneguk.pbworks.com/w/file/fetch/144427350/kusajujar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e55d957f-7945-498b-9310-38d7106c8a08/lexmark_ms310d_toner_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e96b5e28-ae5d-4f65-8cb0-2224ef6dbf3d/worksheet_10-2_area_of_trapezoids_rhombuses_and_kites_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e3434f-8da4-4541-b41c-cc7098d18e1e/35423888219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb667c35-a772-4475-8c47-41a517ee6f17/35749502961.pdfIn PDF document text
    • http://xeninexiruvo.pbworks.com/w/file/fetch/145174263/affidavit_of_support_f1_visa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f72089b-5403-4dc5-bd71-b9a7952ddd5f/jojo_all_stands_tier_list.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_off0000d7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AE 5144 bytes
SHA-256: 819be5db4dab5bd76a9d36679f81cb4a3372a3616d5affea1afa0a587bca6760
font_01_sfnt_off0000e8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 10824 bytes
SHA-256: 58c936d80c64c5f0ec6be023226e398f5548125c92848e45b8d8fe5a81ff0b35