Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db268413d04918e…

MALICIOUS

PDF

87.1 KB Created: 2021-02-09 10:25:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 69419986e2ea415087b906f4959922dd SHA-1: 9ebe60a829707891c4324625f0d58c4843028d62 SHA-256: 3db268413d04918e8d2d0d96f4b6dd74279a1017dcf256eecea4f92341b6b437
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a large number of external links, with a specific heuristic identifying a 'PDF link farm'. The primary malicious URL identified is https://baarspo.ru/wb, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/wb?keyword=work%20experience%20report%20example PDF link annotation
    • https://vebajixumese.weebly.com/uploads/1/3/4/4/134483039/xefuxejevaz-kefetenodane.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489257/normal_5ffa36d44e935.pdfIn PDF document text
    • http://arendaavto.taxi/crayola_scribble_scrubbie_pets_apphv75o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425487/normal_5fc693d425886.pdfIn PDF document text
    • https://cdn.sqhk.co/gozigawefo/hejibWo/vivo_video_editor_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/j2HA9gi/76519030633.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/hdnjgib/vozeliv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373304/normal_5ffaf17b36aba.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/1yVHc6F/87168543198.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481403/normal_5fcb290bad5b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/desenaz/alone_together_dan_shay.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/defender_of_the_crown_c64_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/pedanibezolaworoboz.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/isth_guidelines_ttp.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/88847103455.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/fasujajox.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_off00011931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11931 5048 bytes
SHA-256: 2b92ccd92d9a9d8fd5562de7fd1e2e792cc3349f9ddbb1bd2f87f046d92072d9
font_01_sfnt_off00012a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5D 10856 bytes
SHA-256: f24948cc739e6e286858a51b15064d9db2da1a809abe268bdb9d3dcc53ce251b

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