Malicious PDF — malware analysis report

Static analysis result for SHA-256 d356dc9ee08107b5…

MALICIOUS

PDF

97.4 KB Created: 2021-03-12 14:14:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c53d915edde732fa33411ef49ec2eef2 SHA-1: d161cf696a75bd30626e811c4b6023c68f38814a SHA-256: d356dc9ee08107b57b7932f71ac7fc4fa0cc35a42f598e08d1b3b686742ddb56
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 0.9996

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://jacksth.ru/award?keyword=intervencion+externa+auditoria+pdf PDF link annotation
    • http://jojidasusesot.sportsontheweb.net/casio_pro_trek_prg_270.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449183/normal_5ff614aa858ca.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/59969044481.pdfIn PDF document text
    • http://bivaxosufuxibo.mygamesonline.org/alphabet_chart_download.pdfIn PDF document text
    • http://zesenadozefut.sportsontheweb.net/cracking_the_dream_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471719/normal_60334a38510e8.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/how_to_draw_really_cute_anime_eyes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419194/normal_60333cbb623f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386613/normal_601a9e6f36a24.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/kinofejeziduguxiv.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_1df3dd2dc9b0449ab879ead1cca2c848.pdf?index=trueIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_a70be4e5781644e186a53eff6c98af3f.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_9e5d9ad703914d6481855e5072e5750f.pdf?index=trueIn PDF document text
    • http://disoluje.myartsonline.com/ms_project_2007_manual_free_download.pdfIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_3140e0a1100f4531a05b5af0e30b5b89.pdf?index=trueIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_f970fc72d37e42fc9d32c193b02ecb3a.pdf?index=trueIn PDF document text
    • http://jisijuvod.myartsonline.com/business_analytics_degree_salary.pdfIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_995ce1491bf045f4b68b4a42ac5174f0.pdf?index=trueIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_27c36de32a1b4f6799611a096b237fe4.pdf?index=trueIn 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_off00011f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2F 2012 bytes
SHA-256: d8b0ab1d6fa037bad311bde5f74a226344ab10c0d5323ca3aa3833abed517253
font_01_sfnt_off00012891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12891 5004 bytes
SHA-256: 6d154c3acaa1c075a1436f0460d212675462f5379a0db67c89b400d7019f46e5
font_02_sfnt_off000139b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B2 12376 bytes
SHA-256: 94ad4e717e78f01f04a75d9b09d7eb2510b5b5e8b894fd36d4d614ad24659d26
font_03_sfnt_off00016196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16196 16028 bytes
SHA-256: 3e66ce8c90719045bf8f6c8d5f716325bbce29c89c8399c9e71e7e90b46a9b16