Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bbb04b90e520f5…

MALICIOUS

PDF

76.2 KB Created: 2021-02-26 18:48:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6a7f2ac7699b10ccdf162d0a9be44340 SHA-1: 37b35590bd472c15c63b5c3be8b3ad67f8416f8f SHA-256: 23bbb04b90e520f5a958aebca59255c7a5b81c79806e3afc46328c2389957efe
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to a search query, suggesting a lure to trick users into clicking malicious links.

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://ponafet.ru/wb?keyword=my%20flood%20light%20is%20not%20working PDF link annotation
    • http://org-fruit.space/89615285818jt0ld.pdfIn PDF document text
    • https://najatiruz.weebly.com/uploads/1/3/0/7/130738831/bec925035e21.pdfIn PDF document text
    • http://wopafopu.22web.org/netote.pdfIn PDF document text
    • http://trenolgia.buzz/diary_of_a_wimpy_kid_deep_end_release_dated8k75.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/83546471135jfly9.pdfIn PDF document text
    • http://wbigs.space/divozelapevijiljivnd.pdfIn PDF document text
    • http://teenagetutor.online/mawipemuxitale9z5ib.pdfIn PDF document text
    • http://istlan.fun/troll_adventures_walkthroughjuec0.pdfIn PDF document text
    • http://salebox.shop/ball_and_brick_gamebzzbf.pdfIn PDF document text
    • https://sutapupimode.weebly.com/uploads/1/3/4/6/134615637/tobumuw.pdfIn PDF document text
    • http://good-production17.site/billing_address_information_en_espaolplwjp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zoxuwabemowel.epizy.com/75299162667.pdfIn PDF document text
    • http://badunedotefewep.rf.gd/checkstyle_eclipse_plugin.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_off0000ef4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 5224 bytes
SHA-256: 1f3e3d9d350781f9484ae1a045c5e6857f4dbcbec2ffe65e6b2d36df26568509
font_01_sfnt_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 10396 bytes
SHA-256: ae56322f2a87385b4b961370c802c23d5a14eb635727f7c03a59c9eb3bc401a3

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