Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc89d30a907e699…

MALICIOUS

PDF

76.4 KB Created: 2021-03-20 19:30:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f73f43d059de9b83bb546a19e76e2238 SHA-1: 90be20e0e31a089702f13cee9b9165123841af9c SHA-256: dcc89d30a907e6997bc62b9afa44ce64e9de76fb7911b455567b760ea250d411
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://botokaw.ru/strik?utm_term=icd+11+codes+pdf
    • https://bugabomusajo.weebly.com/uploads/1/3/4/5/134509224/9226c473d24c.pdf
    • http://vvd.bar/vogarikupakba5.pdf
    • https://penosemoboz.weebly.com/uploads/1/3/2/3/132302809/e23fdde.pdf
    • https://vusexojepaxeva.weebly.com/uploads/1/3/4/0/134096357/vaxaxufes.pdf
    • https://cdn.sqhk.co/wotirixa/gd0ijig/fifa_approved_soccer_ball_size_5.pdf
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/rufinonaluxuk.pdf
    • https://zizowotedudoma.weebly.com/uploads/1/3/4/6/134641453/kitiniwolere.pdf
    • https://cdn.sqhk.co/zexoribuj/c4ig83M/renerikofejizosulofoxase.pdf
    • https://cdn.sqhk.co/befozaxulot/kjoOjgM/shadow_fight_3_promo_codes_android.pdf
    • https://tidoxanarapora.weebly.com/uploads/1/3/2/7/132710787/9367549.pdf
    • https://cdn.sqhk.co/lusoxepero/fjeVidB/download_unlimited_free_vpn_chrome_add_on.pdf
    • https://cdn.sqhk.co/jagapifa/iggjihC/cat_trying_to_jump_on_counter_meme.pdf
    • http://899themes-demo.ru/65500250748rdme0.pdf
    • https://pujawemufupu.weebly.com/uploads/1/3/2/6/132680931/pomuz.pdf
    • http://bokazisenu.22web.org/manual_glue_book_binding_machine.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_4b3c50132aa847b7a22175dcc76bd1eb.pdf?index=true
    • http://gorefadusajog.rf.gd/dapagatibigusotep.pdf
    • http://sedijinuv.epizy.com/nowuborumufej.pdf
    • http://pinogizege.rf.gd/pest_control_trend_analysis_report.pdf
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_789d8126c3914e04a1992c42f3cdb4b7.pdf?index=true
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_57d88790500d49da94bec9351e46e922.pdf?index=true
    • http://matoros.epizy.com/elder_law_questions_and_answers.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_off0000ed45.bin
bf2febe7e29e80a9c159ed83c956bc63638ef016be226246d644ca00f71978db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 4800 bytes
font_01_sfnt_off0000fdb8.bin
2e372fd92e1455f3a76727d39290444f4f9e8801be13c6f19ea8faf9d88364bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 11908 bytes

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