Malicious PDF — malware analysis report

Static analysis result for SHA-256 1813d448a56c8d69…

MALICIOUS

PDF

66.5 KB Created: 2021-06-14 12:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f20f2d2f172c6d455d00489e61c307d9 SHA-1: d42396f9633b06db3ac8af445edac5130230b5e7 SHA-256: 1813d448a56c8d6904eb8c0633caada01a32320bf00d092e30f88c8e66b690bf
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://drafthe.ru/pbw?utm_term=mayanadhi+movie+torrentz2
    • https://potuvomominoneb.weebly.com/uploads/1/3/2/6/132683031/2772982.pdf
    • https://wegujelad.weebly.com/uploads/1/3/0/8/130813898/83d590c96fbd.pdf
    • https://static.s123-cdn-static-d.com/uploads/4469847/normal_60afe495be694.pdf
    • https://gejosabuvin.weebly.com/uploads/1/3/4/4/134457948/6449724.pdf
    • https://garanokuwepo.weebly.com/uploads/1/3/0/8/130874617/xifux.pdf
    • https://filuramaz.weebly.com/uploads/1/3/4/3/134314207/b2c08fe280.pdf
    • https://buniburus.weebly.com/uploads/1/3/1/6/131637527/tebeganalaze.pdf
    • https://sefubokadizafa.weebly.com/uploads/1/3/4/8/134880044/6365107.pdf
    • https://kunisalopug.weebly.com/uploads/1/3/4/3/134315348/060fe7e7ec.pdf
    • https://tusovaxurekugu.weebly.com/uploads/1/3/4/9/134900319/fojuva_xemikidij_lunusedu.pdf
    • https://xukoperupe.weebly.com/uploads/1/3/4/7/134743664/suduvisadasek-lasuvagiwagaj-gedewo-kotitinir.pdf
    • https://static.s123-cdn-static.com/uploads/4495855/normal_5fcb2401c190f.pdf
    • https://lewumirobubav.weebly.com/uploads/1/3/4/7/134762292/9466839.pdf
    • https://niboxevukok.weebly.com/uploads/1/3/4/6/134649508/4e350ad22d7a3f1.pdf
    • https://perelixaji.weebly.com/uploads/1/3/4/8/134881923/b1d54c6da23ea6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pafunanukexe.pbworks.com/w/file/fetch/144938589/898136454.pdf
    • http://vosebim.pbworks.com/w/file/fetch/144579750/78390310928.pdf
    • http://sepaxebi.pbworks.com/w/file/fetch/144419151/wewomiw.pdf
    • https://uploads.strikinglycdn.com/files/def144fd-ee28-4543-aaf2-266780f437d1/duzewafobepelowusobepogag.pdf
    • https://uploads.strikinglycdn.com/files/18c034aa-031b-4f19-8c96-dcaeca7d99d2/89134036296.pdf
    • https://uploads.strikinglycdn.com/files/3fc750fc-2ed1-415c-9df0-ecdf715a3b7c/tilobik.pdf
    • https://uploads.strikinglycdn.com/files/8756af19-862b-45be-a44b-cb431dea2403/scott_pilgrim_cast_and_crew.pdf
    • http://sozakuvepar.pbworks.com/f/nabasuwo.pdf
    • http://zegugas.pbworks.com/w/file/fetch/144411402/98489508918.pdf
    • https://uploads.strikinglycdn.com/files/b0031b16-4103-4b15-9829-609299330340/jibosos.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_off0000cab4.bin
0d75f8569408d5b31a7a2945172f1869e5492fe8972dcb32242516d1c762bb79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 5204 bytes
font_01_sfnt_off0000dc5b.bin
d3e752b2158f877074029930c2fcaae501bd98dd04832624290b4d5b05bc2698		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 9472 bytes

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