Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9be830c25df7fd…

MALICIOUS

PDF

78.1 KB Created: 2021-03-01 23:06:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 26796a4234f2cab888602059b0136b61 SHA-1: d963964348b84343d04f262e35e17b95dcfecd3c SHA-256: bb9be830c25df7fd7579110d1b84276063678d4f1787916909aa97dc7e105623
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'how to make a flamethrower with hairspray', which is likely a pretext to drive users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+make+a+flamethrower+with+hairspray In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406473/normal_600f04d9d19f4.pdfIn PDF document text
    • https://cdn.sqhk.co/gukawaki/Ykl01kB/i_m_touching_you_tonight_lyrics.pdfIn PDF document text
    • http://tetiviguxawik.getenjoyment.net/modern_crochet_patterns_and_designs_for_the_minimalist_maker.pdfIn PDF document text
    • http://sitebomobegux.sportsontheweb.net/aprender_ingles_gratis_app_store.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487631/normal_602abe300474e.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/59144375101.pdfIn PDF document text
    • http://gallery-shop.site/waxuxukaw9birg.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/pixuf.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/ghhcigD/65323454217.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/MijFjKM/escape_from_alcatraz_triathlon_swim_video.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/vevutikuluvuxexogos.pdfIn PDF document text
    • http://dmgameplan.com/repatututuvufafovixufebkxv9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rowigos.rf.gd/37776226684.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 5360 bytes
SHA-256: b035885ef9b5ed178962f06668dbc844f55bfdc4c9c3ce06149af321882013a8
font_01_sfnt_off0000fe79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 10584 bytes
SHA-256: 3024f156474298f46c4ad5f5d41cad45661ad013ef2a809b3d80781c1ad17274

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