Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53f0acb7260150e…

MALICIOUS

PDF

80.1 KB Created: 2021-03-16 05:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d2a2165709e0a9fe8e66c38650f22bdb SHA-1: cfeb40966218557b85595b7626e13aae716de44f SHA-256: a53f0acb7260150ee3dfdf2792a27732f378cb032b0bcdc8f1618e4f7474fc7d
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, many pointing to disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection further supports its malicious nature, identifying it as Pdf.Phishing.Trojan.

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://resalured.ru/wb?keyword=does%20wd%20my%20passport%20work%20with%20xbox%20one PDF link annotation
    • http://poguzozod.sportsontheweb.net/73993340902.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415304/normal_5fc8b758e55a5.pdfIn PDF document text
    • http://finipupote.mywebcommunity.org/pride_and_prejudice_2005_script_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393483/normal_5fc8b4ab2f79d.pdfIn PDF document text
    • https://nonesuwenuvav.weebly.com/uploads/1/3/4/4/134400251/musopaka_rogepusulofomu_vufamepeneg_derutewitepuno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449424/normal_5fe7ff3d80ad0.pdfIn PDF document text
    • https://dejutuzalusabi.weebly.com/uploads/1/3/4/8/134869317/3a58f55921d.pdfIn PDF document text
    • https://xalifabosivibu.weebly.com/uploads/1/3/0/7/130775217/kutim.pdfIn PDF document text
    • https://gosabotef.weebly.com/uploads/1/3/4/3/134332229/nanage.pdfIn PDF document text
    • https://wonulabanasilod.weebly.com/uploads/1/3/1/4/131482851/3473815.pdfIn PDF document text
    • https://dixelopenam.weebly.com/uploads/1/3/4/5/134590152/lefise.pdfIn PDF document text
    • http://kajejib.medianewsonline.com/anti_deep_freeze_7.21_free_download.pdfIn PDF document text
    • http://mebotus.mypressonline.com/tolaw.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
    • http://zikenonuto.epizy.com/gedodunitiposafonowudun.pdfIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_84aa49773a8d42d1a6bf1414b530239b.pdf?index=trueIn PDF document text
    • http://lonozixugixapap.epizy.com/32776147951.pdfIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_277c572112df4e7ab17d0baaf1af46d5.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 5420 bytes
SHA-256: 1819ad3b12d0e49da1ccad95116675d370e34188b1181e79fb254eb605a892fd
font_01_sfnt_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 10700 bytes
SHA-256: 55563e2381e2841f3e43b03616f1a5a84fea3697c97b387edf367b08308840c9
font_02_sfnt_off00012527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12527 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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