Malicious PDF — malware analysis report

Static analysis result for SHA-256 851b52fa97b77063…

MALICIOUS

PDF

79.4 KB Created: 2020-12-20 19:52:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c3a2c7474794af6aabdecf06079d59b6 SHA-1: 95c9f782c694034f76aea95d47846d2d3027be6b SHA-256: 851b52fa97b770636afd444bbcf71db221e2ab0902b3efe55a8b199c936b78cd
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URL that mimics a search result, likely to trick users into visiting a malicious site. ClamAV and ML classifiers strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains strings related to the URL, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/aws?utm_term=chennai+express+songs+video+hd+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f9c4eefd2e1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475406/normal_5fdf2ee062002.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464700/normal_5fddcfd43e836.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370071/normal_5fc61d77d6aa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460944/normal_5fd27a28660d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372354/normal_5fb497a045c58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375195/normal_5f8a70cb55091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488317/normal_5fd30e6738a35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406777/normal_5f9243eb36a87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444358/normal_5fba762aa7973.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383804/normal_5fa3dd16a4036.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/fedufiporara/jupigizodudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32dd0cef-362b-40da-ac0c-c04557a7e064/bipativotom.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/springboard_algebra_2_answers_page_15.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/018ca243-bce2-4ffa-bce0-660ce8ad5d3a/rozekunira.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_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 5128 bytes
SHA-256: 3f81bab01fea4dafb496a878bbab5fae68781d1219551a8a48fe633dfa4a7a80
font_01_sfnt_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 10816 bytes
SHA-256: 5b39f6146c3eed5c80d3797c8227573c363e1ed7d62ed013206519d2439e1577
font_02_sfnt_off000120c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C0 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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