Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b082cb3be8693d…

MALICIOUS

PDF

73.0 KB Created: 2020-12-28 11:40:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b342433bc315867b399a4fc889e8d255 SHA-1: 2b7e5e53b9c4012e0db15ee67614a91ca1cc66ff SHA-256: d3b082cb3be8693d0a8c987ada7dff7b6571733fbbeef847f05f705b852e4857
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://trafftec.ru/123?utm_term=charter+organization+representative+training', is likely part of a phishing or malware distribution scheme. The presence of embedded JavaScript, indicated by the T1059.007 technique, suggests the document is designed to execute malicious code or redirect the user to a compromised site. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafftec.ru/123?utm_term=charter+organization+representative+training PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375207/normal_5f91b2bd233f6.pdfIn PDF document text
    • https://mevajivikupewog.weebly.com/uploads/1/3/0/7/130775189/3425202.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470209/normal_5fc4e8017f6f5.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://s3.amazonaws.com/kujapomib/zisuberinoworanoxet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55fa1098-4256-44aa-838a-dcbf73db8d22/82071962887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a147a1e-a8fb-4e09-be43-b2a010411509/naranja_mecanica_pelicula_completa_y.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70caa4e8-726a-4461-878c-cd12e9891944/slope_cool_math_games_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76013178-b07e-46c8-b75a-8b423f649c9b/koi_to_uso_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/beltline_bar_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a73edac2-12a7-41fc-9252-a25177c4f311/best_bdo_class_2020_reddit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F9 4972 bytes
SHA-256: 6f6ff9ea903ed320d8a1f884bb1f6a7f7092d780a5f4174bacbc4e7950002a36
font_01_sfnt_off0000e4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EA 10848 bytes
SHA-256: c785c77ea0b501ebeaa9cf32ab995e8859e60bf61bb2ed94865a881bb18fa319
font_02_sfnt_off000108c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C6 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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