Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd3b63c1439a4a6…

MALICIOUS

PDF

78.3 KB Created: 2021-06-08 03:40:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0b562be616346a013cc80069e859052e SHA-1: 52bd680e70a8a564324f6fb229489fab8c2e2b9e SHA-256: cfd3b63c1439a4a6b2cb138d7948e031174a6dff3c5a8f41b884fe2acce2ba59
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URL pointing to a suspicious domain, likely intended to redirect the user to a download or phishing page. The presence of a download button lure further supports the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=vidmate+app+download+install+new+version+2018+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428083/normal_605f92c36c902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_601280d7cb452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_60399ad93aeaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479474/normal_600b44176d32d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471481/normal_600b616f5f38f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404296/normal_5febf53ebb4f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481072/normal_5fd18d2a1b2d9.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/aa1e7149-5749-46a9-b332-7abd2f47f8ad/20965029424.pdfIn PDF document text
    • http://beratirupo.pbworks.com/f/44231402612.pdfIn PDF document text
    • http://kusarolox.pbworks.com/f/how_many_calories_are_in_a_krispy_kreme_maple_glazed_donut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2bdd399-8392-4745-8a65-03374ca8df5c/makodemusesasijadufikuro.pdfIn PDF document text
    • http://betifabito.pbworks.com/w/file/fetch/144796560/gotexujab.pdfIn PDF document text
    • http://molitutolu.pbworks.com/w/file/fetch/144586731/rezojegozazupivawesozas.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/w/file/fetch/144512298/68035413854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6dbce4b-4c71-4626-9437-63c450918da2/what_does_the_abbey_symbolize_in_the_masque_of_red_death.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/w/file/fetch/144512748/90792764442.pdfIn PDF document text
    • http://betifufato.pbworks.com/w/file/fetch/144613413/47499569715.pdfIn PDF document text
    • http://legesir.pbworks.com/w/file/fetch/144829467/85479763513.pdfIn PDF document text
    • http://matekid.pbworks.com/f/14147441891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42e886af-3817-4ef9-beef-78c35a318ea7/fifty_shades_freed_soundtrack_download_mp3.pdfIn PDF document text
    • http://tereburokofe.pbworks.com/f/fetimozunarabeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c1aa14a-e2c0-44bb-9a4c-a60c45b91c3f/dofejubulumopazekuninej.pdfIn PDF document text
    • http://sawanixum.pbworks.com/w/file/fetch/144511125/fenafepukodaregazimof.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 5808 bytes
SHA-256: a8d8625561b4d1fad4f219ad676bb2e5e4fa4ab56c3c5bd86aa000fd3efdfe4b
font_01_sfnt_off000104d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 11348 bytes
SHA-256: 1cfb28d5a652dece2f6a8af0471639c9d4775af8b58808b2084a1763d81d6aa4