Malicious PDF — malware analysis report

Static analysis result for SHA-256 2607d58aac658442…

MALICIOUS

PDF

78.7 KB Created: 2021-06-01 09:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1776a76940de90892fb810cc60620383 SHA-1: 716648d9e13ef5d6762de432838ec1e9dd7a0f99 SHA-256: 2607d58aac658442861a1f6763ad361f1226cb9c43c7b031ffc1a93c53d81028
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, further supporting malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://gimoguvi.ru/123?utm_term=kocostar+sheet+mask+review
    • https://static.s123-cdn-static-d.com/uploads/4471099/normal_60b4e954ab150.pdf
    • https://static.s123-cdn-static.com/uploads/4368242/normal_5fde24744a663.pdf
    • https://cdn-cms.f-static.net/uploads/4367625/normal_603f6990d5317.pdf
    • https://cdn-cms.f-static.net/uploads/4379973/normal_606b784a5217d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xovelezid.pbworks.com/f/visual_studio_code_python_tutorial.pdf
    • http://barumena.pbworks.com/w/file/fetch/144440010/lazoxi.pdf
    • http://pupowivala.pbworks.com/f/spss_survival_manual_julie_pallant_download.pdf
    • https://uploads.strikinglycdn.com/files/b9891e18-8f24-413d-bb2d-0b3bfb69b06b/31169203962.pdf
    • http://bemulopawed.pbworks.com/w/file/fetch/144442314/wii_u_emulator_minimum_specs.pdf
    • http://xojifot.pbworks.com/f/pudivi.pdf
    • http://nosiravuga.pbworks.com/f/gizuvujazemovefelumo.pdf
    • http://sonopewobu.pbworks.com/f/71147474544.pdf
    • http://niwomif.pbworks.com/f/48693249041.pdf
    • https://uploads.strikinglycdn.com/files/a7651209-91a5-4bc0-a909-1914e78868d7/como_descargar_hello_neighbor_alpha_4_para_windows_10_gratis.pdf
    • http://giwupiraride.pbworks.com/w/file/fetch/144445404/85027404645.pdf
    • https://uploads.strikinglycdn.com/files/3d5864c0-d3ab-4479-94d9-4321faa2a774/dewalt_dw713_manual.pdf
    • http://viluxese.pbworks.com/w/file/fetch/144428688/razudad.pdf
    • http://tazijebep.pbworks.com/w/file/fetch/144419616/21294455551.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ba.bin
e741c82fc8dc81ad438939956ab7937a5c94f28972a716c9462a6480fdd21ba0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 5192 bytes
font_01_sfnt_off0001074f.bin
c6da8db5757707ff034d5a999c344f3ce110aeaee9fa32bfaf6db05fb8fb7db0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 11312 bytes

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