Malicious PDF — malware analysis report

Static analysis result for SHA-256 450f46b5278a3b98…

MALICIOUS

PDF

78.3 KB Created: 2021-04-16 23:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3a2eb389108366cc25358ffe82447f50 SHA-1: c4001c9084df55d444813fdc319882c37ade19df SHA-256: 450f46b5278a3b983b9bb1c3ba52043550c1923f3a1ca6edaad2bf652c5db11f
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body appears to be obfuscated or corrupted, but the presence of multiple links suggests a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=homelite+3100+psi+pressure+washer+replacement+hose In PDF document text
    • https://katozela.weebly.com/uploads/1/3/0/8/130874493/cc059e5be5f92c.pdfIn PDF document text
    • https://cdn.sqhk.co/wegifopi/jejgLK2/41517163973.pdfIn PDF document text
    • https://todatotosikuped.weebly.com/uploads/1/3/0/7/130740429/tedege_mober_jebijove.pdfIn PDF document text
    • https://cdn.sqhk.co/wenejusuzixe/ggflEjd/61398790443.pdfIn PDF document text
    • http://vitrinachel.ru/30316623780zo0cl.pdfIn PDF document text
    • https://nugumogixowujo.weebly.com/uploads/1/3/1/4/131437940/8556648.pdfIn PDF document text
    • http://reduslim-buy.site/how_to_reset_error_code_on_rinnai_tankless_water_heater3tt0r.pdfIn PDF document text
    • http://am-sound.ru/maviluminevuxepabs7qer.pdfIn PDF document text
    • http://esclub.info/89694007074pzym9.pdfIn PDF document text
    • https://wijununag.weebly.com/uploads/1/3/1/4/131438003/bumodexogo.pdfIn PDF document text
    • https://gefizubumob.weebly.com/uploads/1/3/4/4/134473977/b46f5.pdfIn PDF document text
    • https://cdn.sqhk.co/fegibidizog/oggmThe/jjba_soundboard_android.pdfIn PDF document text
    • http://geesecam.com/660580914657vnr8.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/ftjdJij/drake_n_trap_mod_apk.pdfIn PDF document text
    • https://witiderinusoj.weebly.com/uploads/1/3/1/4/131483097/2348310.pdfIn PDF document text
    • http://itash.space/95389111304g1a6w.pdfIn PDF document text
    • http://leafester.online/feputj6y2z.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/jagghc6/83909700161.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mutatafolusak.epizy.com/kavosuxigum.pdfIn PDF document text
    • http://wokoxut.epizy.com/21288888375.pdfIn PDF document text
    • http://sapifux.epizy.com/environmental_impact_report_negative_declaration.pdfIn PDF document text
    • http://debarunuzijabe.rf.gd/audit_report_of_llp.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_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 5584 bytes
SHA-256: fc1401efe967546f174f7302c0b69b1a3cbb8f3369b9448ae069920a58816ad7
font_01_sfnt_off000104c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C9 10948 bytes
SHA-256: ecd76440a46458ec3c8b04fd46e95a77abc2e8d44568cdd776af310a327b66f9

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