Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c8ad700829bc57…

MALICIOUS

PDF

74.7 KB Created: 2021-04-04 16:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e98f8c69db224b8d574fb155ac4ec12f SHA-1: 20b783dd16af134d214ad5cd0745b34a20de9ef6 SHA-256: c8c8ad700829bc574d27abf62400d64cdeba2d427fd03a4196477a7777efcd44
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating many links on disposable hosting, suggesting an attempt to obscure the true destination or evade detection. The presence of embedded URLs points towards an attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://soxebez.ru/wix?keyword=vi%25E1%25BB%2587t+ki%25E1%25BB%2581u+m%25E1%25BB%25B9 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382620/normal_5fe05a1142dcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_605b4bcf4b1f0.pdfIn PDF document text
    • http://ruwufuwetoj.mygamesonline.org/gilunikajotibiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460688/normal_602113b18f78c.pdfIn PDF document text
    • http://wulutapebime.getenjoyment.net/ratisewivikewupujarojugir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472783/normal_5ff03f4fe781d.pdfIn PDF document text
    • https://sobanuwutotamiw.weebly.com/uploads/1/3/4/1/134131644/8420951.pdfIn PDF document text
    • http://wegoluxetas.scienceontheweb.net/saps_accident_report_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386335/normal_6056f432e1df5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484820/normal_5ffd1e4926ff6.pdfIn PDF document text
    • https://narukomoforu.weebly.com/uploads/1/3/4/3/134320250/pedifuwaziroze-muvitidevit-nemitozubob.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/biography_of_kalpana_chawla.pdfIn PDF document text
    • http://aazzzry.space/zutigucrhmo.pdfIn PDF document text
    • https://xusedivofasug.weebly.com/uploads/1/3/2/7/132741162/6123943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_602c77ac9f940.pdfIn PDF document text
    • http://bathforlegs.xyz/kunotugamijevedekenipoddsv.pdfIn PDF document text
    • https://bonuxomudod.weebly.com/uploads/1/3/2/8/132814593/zufufajaxagube.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_cdf57d16328f45a1a9f9f221085db297.pdf?index=trueIn PDF document text
    • http://matewedidoxeber.onlinewebshop.net/8573931380.pdfIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_96ef4aec7e78452294df1758d8010b51.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CA 4888 bytes
SHA-256: 9227d79947c88a4c2001664b5fa67faa18648916b34247fcc578983962bf833d
font_01_sfnt_off0000e9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 22984 bytes
SHA-256: 8012372e3990369a44c3d8a54ee630e323cc904690b6401529d4b49e6aa362f0

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