Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d70c638b4a7374…

MALICIOUS

PDF

59.8 KB Created: 2021-06-03 02:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffb646ae1219b5810deeb5422ac265d5 SHA-1: e77c8d1fb1d4db0563d393c66d448b80ec152ee9 SHA-256: 42d70c638b4a7374b42b4556364784b29b0023e8172fe8818e95272abfbb59ed
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to other PDF files, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9697

Heuristics 4

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://philabc.ru/pbw?utm_term=writing+word+equations+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4485309/normal_601b4a4cd13ce.pdf
    • https://gikijeza.weebly.com/uploads/1/3/4/4/134465371/gepiwizoki.pdf
    • https://xopusetimova.weebly.com/uploads/1/3/4/1/134108877/tuvawagaxekupo-zegetaje-pomifidin.pdf
    • https://cdn-cms.f-static.net/uploads/4472768/normal_606b8000a5431.pdf
    • https://vinaribibivo.weebly.com/uploads/1/3/1/8/131871854/nurowutakujebip-votax.pdf
    • https://nofiluwovix.weebly.com/uploads/1/3/0/7/130739726/0bc7c8a102c.pdf
    • https://cdn-cms.f-static.net/uploads/4409797/normal_6024fbbe7ed79.pdf
    • https://cdn-cms.f-static.net/uploads/4485321/normal_601ff17c2c902.pdf
    • https://rewiwolidinagi.weebly.com/uploads/1/3/4/4/134481042/79b92e5829.pdf
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/63d74bafa.pdf
    • https://bejejedagaf.weebly.com/uploads/1/3/4/8/134862385/jisuwixadigofolibum.pdf
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/zuganoxufodip.pdf
    • http://xifilipisi.pbworks.com/w/file/fetch/144413748/what_is_importance_of_family_planning.pdf
    • https://uploads.strikinglycdn.com/files/3cfcd87f-630e-4e85-bf67-309924e485f0/6860252494.pdf
    • https://uploads.strikinglycdn.com/files/9605cbde-00be-4dba-9837-06a37faa8f81/xebipitipatol.pdf
    • https://uploads.strikinglycdn.com/files/204335c8-f4bb-4c04-a8fe-effb08daa124/voxozuxetekixake.pdf
    • https://uploads.strikinglycdn.com/files/4de58b20-f9b8-4bfc-993a-0fe689d7b6a5/kanaxar.pdf
    • http://jolowajuwijo.pbworks.com/w/file/fetch/144522417/antenna_and_wave_propagation_book_download.pdf
    • https://uploads.strikinglycdn.com/files/9c3ef0ea-de81-41d1-92f0-c591f5f85253/rafezukinavaroxegolapuwig.pdf
    • https://uploads.strikinglycdn.com/files/1393505c-4703-4ddb-bd73-4964decb8714/29589202910.pdf
    • https://uploads.strikinglycdn.com/files/81209def-dd8c-45f6-95fe-65d37fc1a90f/do_samsung_phones_get_android_updates.pdf
    • https://uploads.strikinglycdn.com/files/ce3325d1-e04a-423c-8b9e-a194485a12b8/15520954386.pdf

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