Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e14dbc8f952b220…

MALICIOUS

PDF

72.0 KB Created: 2020-12-23 00:35:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2eada0cff2e9ccf1d58e93d1189d4052 SHA-1: 23a514e74a10f6c20ffdd00eeb80264d0d39530f SHA-256: 8e14dbc8f952b2203c8e8e0706e614ca62397a85399bc0576e03a1aaa89d73ee
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=sherita+dixon-cole+37+from+grapevine PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477623/normal_5fd2ab3d9ad18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_5f9a0dec8512a.pdfIn PDF document text
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/579016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_5fbbaec7e828e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455194/normal_5fc473793672e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377408/normal_5fafdc0129e0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370746/normal_5fc5a8daa4e98.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/bubeto/civil_rights_act_1955_upsc.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7b23bd8e4f44799689ea7/t/5fcf01bb24ae147ef3d3b401/1607401915854/mamaradur.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/15556609575.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b2678139af037665e521/t/5fc927dc98f8860e339e008d/1607018461294/jnv_9th_class_admission_form_2021-_22.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e90c27a199023ab56552/t/5fc159363f75b1664306b337/1606506807969/johnny_cash_ringtone_app.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fe13a16c0a0fa116c3c3573/t/5fe16d70e3486d27204d3186/1608609137464/besinapejadokatimuxa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd37888094fd3ccf307d49/t/5fdd7691fb7de13a64444003/1608349330392/free_call_recording_app.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_off0000cdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAE 5684 bytes
SHA-256: b0551e0952db3c6f10eaea76657229c9d7a2086df27f8f4e507cef748889b045
font_01_sfnt_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 10580 bytes
SHA-256: 1ebf383d8c1bc9d7e860fd373d931f97820b53a2e95852ea70cfa892e2b8798b
font_02_sfnt_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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