Malicious PDF — malware analysis report

Static analysis result for SHA-256 48304789064cd233…

MALICIOUS

PDF

73.2 KB Created: 2021-01-18 04:20:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 385dcda6a4b268c384183f5a23c142f0 SHA-1: 5fbbf847b4069bdf860275ca04ced6814af2bd75 SHA-256: 48304789064cd233cbf246b341ca261eac3bdd9dbcc5a3906652d5593967d4f2
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded URLs suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the links and the ML classification indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=smooth+is+fast+racing
    • https://static.s123-cdn-static.com/uploads/4417029/normal_5fc935d48869c.pdf
    • https://static.s123-cdn-static.com/uploads/4480732/normal_5ffe7b889b299.pdf
    • https://site-1245311.mozfiles.com/files/1245311/40799589933.pdf
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/67362.pdf
    • https://site-1171749.mozfiles.com/files/1171749/funny_maid_of_honour_speech_templates.pdf
    • https://sedanafijokam.weebly.com/uploads/1/3/4/8/134888359/delewupe-wimigakuj.pdf
    • https://cdn-cms.f-static.net/uploads/4369494/normal_5f9172d9839d5.pdf
    • https://gusumumonabol.weebly.com/uploads/1/3/0/7/130775475/0a65f620072b74.pdf
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/b6749d847b.pdf
    • https://site-1176277.mozfiles.com/files/1176277/98372591229.pdf
    • https://mamudige.weebly.com/uploads/1/3/0/8/130874639/wudosun-fubotajumobego-gawifojula-lewatev.pdf
    • https://burogoga.weebly.com/uploads/1/3/2/7/132740280/accae4a823f1f.pdf
    • https://static.s123-cdn-static.com/uploads/4481064/normal_5fdd75eba9e1b.pdf
    • https://ziwagunu.weebly.com/uploads/1/3/4/8/134883986/7586557.pdf
    • https://tatonipek.weebly.com/uploads/1/3/4/8/134874136/wixofamaxerizetev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dinigugaxej/11568155691.pdf
    • https://s3.amazonaws.com/zabevog/limbo_mod_apk_download.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_off0000e151.bin
849a4a4754c3d1ceb2ef363bd592b792e597b9c6da10e5f4f59de1c677341ac6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 5368 bytes
font_01_sfnt_off0000f364.bin
51c7b5fdd8312c4e7b33dc8b838c1c2c5b1c1ca79ad04de7dc76eecd7a595310		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 10652 bytes

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