Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a36ca59c8579d7…

MALICIOUS

PDF

96.7 KB Created: 2020-11-19 23:59:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0173dcf23e621abcf5c1ddf64ea20c9b SHA-1: 5bd6005ffbd73cc18c527880a88fd505d18a4523 SHA-256: e7a36ca59c8579d7904cc71b32a914511cfd4bfe99f050799d8183edb51c6ea5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffe.ru/strik?utm_term=examen+tipo+comipems+para+contestar PDF link annotation
    • https://rozujefugupag.weebly.com/uploads/1/3/4/0/134017035/befamudevavif_nakorixoziza_zojaduzosup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420013/normal_5f96a4d0c55d8.pdfIn PDF document text
    • https://zijavenokin.weebly.com/uploads/1/3/4/3/134315340/b0668d179df5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_5f91428c4ed52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416805/normal_5f953b5d87936.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384155/normal_5f8e99d52529d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/damerirazib/catalogue_schneider_electric_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49ffb781-3102-4356-acfe-66240a5abf16/92430026513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe2d66a-7f1b-4e7f-b72c-895e07b8ead6/futopibuworopemejol.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/forbes_magazine_cover_template_psd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d6a21bf-0ed7-49fa-9ff7-54739dfaeeb8/gifememekekasesovawenuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/738854af-b807-4a09-9f4e-5d99eb8d0094/magic_bullet_blender_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d11b4ae0-f19c-4731-9ed3-d2140fcf9490/surivabef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B38 4860 bytes
SHA-256: ae039bd089c64577065d20f02b1f7d8100b136bffd4bfef5bc1fb95e028c7fc6
font_01_sfnt_off00013b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9B 12868 bytes
SHA-256: 3b71104d2988c10b4393c5e5b969ae92b3dce2c865819faf20b50e7072ba4288
font_02_sfnt_off000165f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165F3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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