Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5af425c6c0f246…

MALICIOUS

PDF

77.3 KB Created: 2021-03-12 20:15:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7db401e68253be4df4066db2efa30b26 SHA-1: 7851775ee3a5de8a2985ee97dd082bf1ce943a15 SHA-256: ae5af425c6c0f246b5b059fa9a2a649befbc613759caeecfb1ca526489a63ef7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, and is classified as a "link farm". The primary external URL observed is "https://xezojetit.ru/award?keyword=gastroparesis+diet+handout+pdf", suggesting a lure to a site that may host malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://xezojetit.ru/award?keyword=gastroparesis+diet+handout+pdf PDF link annotation
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/fajez_fujosoziwi_lifor_pasobezate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411937/normal_603c08cb49398.pdfIn PDF document text
    • http://serururepus.scienceontheweb.net/40397405218.pdfIn PDF document text
    • https://zewajala.weebly.com/uploads/1/3/1/3/131398225/4d08929899.pdfIn PDF document text
    • https://kobirozo.weebly.com/uploads/1/3/4/8/134846370/7d604.pdfIn PDF document text
    • http://ditoterelutas.sportsontheweb.net/what_is_emphasis_in_interior_design.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380674/normal_600fc92b08db9.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/75644497599.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/93525890765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490272/normal_5fd60f1e1a22e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_c80f68cfa6f8428a8168ed7affd53366.pdf?index=trueIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_9870511f60364489a146892af0448f9a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujanozo/86762449515.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/google_sheets_how_to_freeze_top_row.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/47564779507.pdfIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_fd4933482ba64da49d7c00b1bd794acb.pdf?index=trueIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_f6af0a95e904430984a126c3679179ae.pdf?index=trueIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_df5a136c2fb64f8d9f7c5c68af04bb99.pdf?index=trueIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_4793deb6c63e4af0841a8e48bf78c275.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_8ac74193987a47b1b04d184d08f8dd84.pdf?index=trueIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_cbfb75a0f4f34dd1a995d6a7852d032d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/cg_dj_remix_video_song.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_517f11ec06544b3283b62b137389ca71.pdf?index=trueIn PDF document text
    • http://lumosaneja.onlinewebshop.net/how_to_use_digital_multimeter_free_download.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_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 5128 bytes
SHA-256: 32e15c739875a1d1d3012ce72163b1db8cd72569803571c6166868140902cc74
font_01_sfnt_off00010334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 10716 bytes
SHA-256: 01d0bfd0d4b7711d1732f1b2d5d367b3f9c17a581cdb6c8912d3d42ded94f5ff

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