Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c4f21d0aff3291…

MALICIOUS

PDF

183.0 KB Created: 2021-03-29 08:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6f2d55e35abe5132e123106685fad1df SHA-1: 958696a2df4190243759a0ad9fd2ea4407ba4878 SHA-256: 18c4f21d0aff32911c3c1975f85afdd88cf24ec5438abaedb032a2d4523bd1eb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a domain that appears to be a link farm for free downloads, likely a lure. The PDF's structure and embedded content suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://maypoin.ru/award?keyword=la+pasion+segun+antigona+perez+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489263/normal_6001119ea8f1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374545/normal_6032bf3fbcf20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485321/normal_6031850ab4159.pdfIn PDF document text
    • http://tomokatixo.mygamesonline.org/yaesu_ft-450d_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408463/normal_5fc997c1bd184.pdfIn PDF document text
    • http://lipazegeboludep.sportsontheweb.net/free_calligraphy_workbook.pdfIn PDF document text
    • http://pasadurasasagi.medianewsonline.com/xuxakidonedezaguxitaliz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_60381544658e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_605537c451430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425924/normal_6037c8df72f82.pdfIn PDF document text
    • http://zasufigonibat.getenjoyment.net/bumoseda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_6041989f7d710.pdfIn PDF document text
    • http://dexaputanit.mygamesonline.org/brgschaft_miete_eltern_vorlage.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489981/normal_5ffcc3ef05958.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487419/normal_5fc5bf46904c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380867/normal_602d7a1934ef4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377908/normal_5ffe01ea21e09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_7478bf95d6d64535806ca2df157fbbe3.pdf?index=trueIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_565c85aba4d249f6b239458505adcbde.pdf?index=trueIn PDF document text
    • https://6acbaf94-bc62-4fdb-9a00-914544f0b606.filesusr.com/ugd/3ee118_40019baed8024460ae15c82671046551.pdf?index=trueIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_26a856528ee0467fb90fe56fca630b43.pdf?index=trueIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_013392d1f8464e638d587e763005c5b2.pdf?index=trueIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_576dc101c57f4e6e8fb32876ab33ba6f.pdf?index=trueIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_5b8956c1c6ea4e26a977b70adbf9c383.pdf?index=trueIn 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_off00027683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27683 5292 bytes
SHA-256: f0d1609b84192de3f0bfe0aea912a8561c243e62626276117e4f9212968e0347
font_01_sfnt_off000288b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x288B6 14880 bytes
SHA-256: 99da0d210d65bd0817e57edbbafd251ce3d6f21ee2f75197a60321f363946aa2
font_02_sfnt_off0002b7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B7A9 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953