Malicious PDF — malware analysis report

Static analysis result for SHA-256 db64996282ce7e98…

MALICIOUS

PDF

75.2 KB Created: 2021-03-03 14:29:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4323c52f2878c5c60f7eef2bc02d6e69 SHA-1: b0118a6e50bf21d060f282daa0e0755c360104c2 SHA-256: db64996282ce7e98d75ddaf17c93953b0889e35d7a755db3ef4c6ee6c7908a30
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to AC compressor troubleshooting, directing users to the malicious URL https://golowaki.ru/strik. The presence of embedded JavaScript, indicated by the T1059.007 technique, suggests the document is designed to execute malicious code or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=how+do+i+troubleshoot+my+ac+compressor PDF link annotation
    • https://cdn.sqhk.co/zinoliwomi/tibYiar/xunifariliwovomuletufum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476941/normal_5ffe789879dca.pdfIn PDF document text
    • http://tiwilofojifig.sportsontheweb.net/35531335927.pdfIn PDF document text
    • https://virefogagivagu.weebly.com/uploads/1/3/0/8/130815228/d1bb20090526063.pdfIn PDF document text
    • https://xinuxarovota.weebly.com/uploads/1/3/0/7/130776268/917b97f207d5dfa.pdfIn PDF document text
    • https://borikalubir.weebly.com/uploads/1/3/2/6/132681749/jesaxov-kigibegiwak-wefutijetajiw-repixineluvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380705/normal_603ed49f8ea2e.pdfIn PDF document text
    • https://kokesekodabese.weebly.com/uploads/1/3/4/0/134012443/2003203.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/los_juegos_del_hambre_sinsajo_parte_2_pelicula_completa_en_espaol_latino_repelis.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/ijJhfqG/87632086897.pdfIn PDF document text
    • https://cdn.sqhk.co/josozudibud/jVuEFha/tippy_tippy_tap_junior_kg_rhymes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411479/normal_603451fee8eed.pdfIn PDF document text
    • https://sulogifobib.weebly.com/uploads/1/3/5/3/135322722/6060125.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/lojemebezozaja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_601c71774fdd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_6016c139dacd6.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/eRnhghb/lojipudamewaxenosilupirit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/jadumiwanuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/sistema_renina_angiotensina_aldosterona_hipertension.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/49727820504.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_off0000e976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 5608 bytes
SHA-256: 12dc90d1fcfe17d004c6c360697c24d4f39d7ac55b4a56e569622a749b26f8ba
font_01_sfnt_off0000fc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC65 10548 bytes
SHA-256: 5faa8112c09850783d31be661972a646a839841001a9474b41e1eb1ddbb92068

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