Malicious PDF — malware analysis report

Static analysis result for SHA-256 378ac5a77b788166…

MALICIOUS

PDF

68.6 KB Created: 2021-05-08 22:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 80e7a406117c8e7cf133f82200be7082 SHA-1: aea9c4e997bde133f1ceb742dafa9a65af56a4cb SHA-256: 378ac5a77b788166e6abf56585f6cadc70b8547d2ba3f9469f95c648fe4e546a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8234

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 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.
  • 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
  • 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://seumenha.ru/strik?utm_term=literatura+del+siglo+xviii+y+xix+en+espa%25C3%25B1a PDF link annotation
    • https://dogeneli.weebly.com/uploads/1/3/0/7/130776728/dudagabo.pdfIn PDF document text
    • https://lilufegat.weebly.com/uploads/1/3/5/9/135965666/2a033.pdfIn PDF document text
    • https://lovefuzabuzonif.weebly.com/uploads/1/3/4/1/134109130/3270895.pdfIn PDF document text
    • https://vamemaxodoj.weebly.com/uploads/1/3/1/4/131437173/zanozinaxamesas.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/AghVfhg/jowawudi.pdfIn PDF document text
    • https://tewizoduwab.weebly.com/uploads/1/3/5/3/135341898/gukozelakufojiwev.pdfIn PDF document text
    • https://fuzakeraza.weebly.com/uploads/1/3/4/8/134848422/ad809aabccaab6.pdfIn PDF document text
    • https://laxabuzataz.weebly.com/uploads/1/3/4/3/134385801/1859d04b38e2d.pdfIn PDF document text
    • https://cdn.sqhk.co/sawomunuj/dMQDQmT/prime_alert_app.pdfIn PDF document text
    • https://rokipidofavum.weebly.com/uploads/1/3/4/0/134042790/633a89c89fa91.pdfIn PDF document text
    • https://lixebofupasiwik.weebly.com/uploads/1/3/2/3/132303312/gijeta.pdfIn PDF document text
    • https://kewusubeve.weebly.com/uploads/1/3/4/5/134515363/megunizoreja_dibifore_reluwebowi_kalisupajedunem.pdfIn PDF document text
    • https://zarimuxeve.weebly.com/uploads/1/3/4/8/134897304/pamipasuxozi_voxiloku_jofosarixaf.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/6njhakk/vujubudigezasofali.pdfIn PDF document text
    • https://puxizabub.weebly.com/uploads/1/3/1/4/131406372/xenilogereraf-gomazezinufoz-kafozibaxil-laroxisova.pdfIn PDF document text
    • https://mosezusimoz.weebly.com/uploads/1/3/1/6/131637881/e96f387dfe3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/92bedc15-b8ad-4e1e-aa6e-f8985a422473/2682613200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4eab0e4-f980-4846-9551-37e5b5131134/19054642660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82060e66-2a3b-42f1-b550-59c817da3013/8332677687.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 5508 bytes
SHA-256: 4b878c823e9f3406981a1fc39696b7eeb2e1757977e16df689fd4f92138e004d

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