Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e6f6660b4cc044…

MALICIOUS

PDF

89.4 KB Created: 2021-03-27 15:25:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d6682de949577bd00be5ee88e220db43 SHA-1: 26998a1d84d0de2e490b06ecada3a7759b8185a4 SHA-256: 99e6f6660b4cc044d1fea87ed3ecbd3e016ba15bd6989623c7f8b549741267ca
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed and point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs suggests the document is designed to redirect the user to a compromised or malicious site, likely for further exploitation or credential harvesting.

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://ponafet.ru/award?keyword=sindrome+de+apnea+e+hipopnea+obstructiva+del+sue%25C3%25B1o+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450724/normal_60111b8bd4407.pdfIn PDF document text
    • https://vewewiganivobob.weebly.com/uploads/1/3/4/8/134852084/jewabekatorulonipu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426957/normal_5fe2bc377835d.pdfIn PDF document text
    • https://wugumura.weebly.com/uploads/1/3/4/6/134601103/jesegafopoz_walikikuxe_ragexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_6049ec6b9ed82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419413/normal_60034c0c7fc79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_605dd9dca520d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_602b93315483f.pdfIn PDF document text
    • https://xagufiwukana.weebly.com/uploads/1/3/4/6/134694649/6126711.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/vojapu/what_are_some_tricky_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/who_pays_for_grooms_tuxedos.pdfIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_12a5a2cd486d4b3f935956bac2c52b9d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/pc_editing_background_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/puppeteer_chromium_revision_is_not_ed.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_4f8425a2cca54a5085b5df4f7f1fbcc9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mulerux/top_online_formal_dress_shops.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/rupegokamixidivid.pdfIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_6b0a32745ada43bc93011440856e9d61.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_off000102e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E1 5908 bytes
SHA-256: a634d47c4b78bd993e7fb891ebbdde26f1adedb6a3a296efb03a82442021e0d7
font_01_sfnt_off0001168e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 12612 bytes
SHA-256: 0e8521d8cb7efc24ebeab533cf5756d7087efe37c104763cb8c134fc3ab8fb56
font_02_sfnt_off00013ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF9 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7

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