Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f65d58f88a37fe…

MALICIOUS

PDF

74.3 KB Created: 2021-01-10 13:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 28d107efc21e4e474db798de50021c78 SHA-1: cf79b344c4c4fc49e838949dd0561daa8a7d668d SHA-256: 24f65d58f88a37fe18d1d6272f5e69fca66b0930df5b8286af1d6da3d5a7ebac
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly and other hosting services, indicative of a link farm or distribution network. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the primary goal is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=tablas+de+multiplicar+para+imprimir+gratis+del+1+al+12 PDF link annotation
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/cd733.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/uejhhgH/teponow.pdfIn PDF document text
    • https://fawawivog.weebly.com/uploads/1/3/4/5/134595284/7588571.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/ha3gi9b/colorchecker_passport_photo_2_davinci_resolve.pdfIn PDF document text
    • https://site-1175458.mozfiles.com/files/1175458/nuzovoja.pdfIn PDF document text
    • https://pexikonafan.weebly.com/uploads/1/3/4/3/134351575/pagazuvabowexika.pdfIn PDF document text
    • https://cdn.sqhk.co/pitadewedobu/GmbgdnF/second_hand_children_s_clothes_online_uk.pdfIn PDF document text
    • https://goruwikok.weebly.com/uploads/1/3/4/7/134740681/9608757.pdfIn PDF document text
    • https://zejibafubetu.weebly.com/uploads/1/3/4/1/134108860/xetisedavevofosede.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/jexijer/76419997630.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/google_docs_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/albinism_disease.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/93189437691.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
    • 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_off0000cdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAB 5668 bytes
SHA-256: 503f5a2c09d4744a4e95a9b6cb6c97eb30245fa8193a0989907b9a7b50cdad1d
font_01_sfnt_off0000e0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 10796 bytes
SHA-256: 60c40074f36b62badbbb0137293006c488ca0446906e42063a309735e916e909
font_02_sfnt_off00010445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10445 16168 bytes
SHA-256: e5458d7b6d82539349b17fc4713a17e1381d471255c72d9f8116b7c86e08c443

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