Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff525cecb9b1bf5…

MALICIOUS

PDF

70.6 KB Created: 2020-11-17 03:39:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ae479fbcb1a926347c663a2420d55f01 SHA-1: ca28557183819d2abd0fd9254bc257e111583b77 SHA-256: 0ff525cecb9b1bf569f9b39feebb03d6c50f414e1234ff89ef5f5e6a6359a238
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://trafffi.ru/123?utm_term=national+wholesale+liquidators+nj+route.+17 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378619/normal_5fa83407b316b.pdfIn PDF document text
    • https://nawajago.weebly.com/uploads/1/3/4/6/134621860/bd4e95f2b8.pdfIn PDF document text
    • https://damitonamusu.weebly.com/uploads/1/3/4/3/134306925/4009695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_5f98f41bb91a7.pdfIn PDF document text
    • https://gowokijisamupu.weebly.com/uploads/1/3/4/4/134438950/1687443.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/nisutepokuzuguna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413016/normal_5f9e3fcdadadb.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/94d0d837-353d-4c5b-9fcc-61164bbbaeb1/furebizu.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/hongos_deuteromycota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecc8e3de-fc20-4b33-9564-d6ff65f7af05/nutri_ninja_pro_bl450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc91b87a-1b70-442b-9185-859b928c5007/dexerag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88f30190-99e9-4af1-a617-eb49210b5a35/bilegalesafedupegidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dbd1f84-8193-4fda-a74d-48af902c3ffc/90184230375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8df4475-00b9-4ed4-a22b-cc73bfa36b56/kitugapubujofuwuxoj.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/wejofejebuwalofomibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b3b0054-0324-4336-98fd-eeac91457839/61425657500.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD5 5340 bytes
SHA-256: 2e271e7952ef99b40aae45bf9b8d516706c0642dbe3b60eb5d71e1f74732df93
font_01_sfnt_off0000d01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01A 11540 bytes
SHA-256: d7d09e483af5d41f7745ddd65278532ab7a9eb4bc73221fd7fbe77fc7b8c2e7c
font_02_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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