Malicious PDF — malware analysis report

Static analysis result for SHA-256 f448325d77e25e14…

MALICIOUS

PDF

74.6 KB Created: 2021-04-29 08:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3998fc1aeeff517148f61fdc632512a9 SHA-1: 5258e23ee7b141a6d94e38d6291d68c96b983ae1 SHA-256: f448325d77e25e145c9e1205a8457ce2a09bf662b30683dfd0694d1725b778f7
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, a technique often used for SEO farms or to redirect users to malicious sites. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to lead the user to compromised or malicious content.

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://jacksth.ru/strik?utm_term=na+living+clean+the+journey+continues+pdf PDF link annotation
    • https://tedarotola.weebly.com/uploads/1/3/1/4/131482933/bb595ef363c.pdfIn PDF document text
    • http://galajanexagaj.iblogger.org/bupugefazuwomedixedagot.pdfIn PDF document text
    • http://zoluwofemofuper.sportsontheweb.net/zidugadovi.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/ed7d363a02cbfdd.pdfIn PDF document text
    • https://wekexodaxax.weebly.com/uploads/1/3/4/7/134713384/5babc2.pdfIn PDF document text
    • http://wuxetij.mypressonline.com/how_to_activate_my_motorola_modem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funitavib.rf.gd/python_programming_book_bangla.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/cuantas_calorias_tiene_una_cucharada_de_miel_de_maple.pdfIn PDF document text
    • http://mewoxulo.epizy.com/sowiladilevi.pdfIn PDF document text
    • https://7c50ec62-1ece-451b-b03c-4788199016cf.filesusr.com/ugd/635f3c_cee301d5c27a4d77a9f923b9f75206ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/83905084102.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/tizofupetitixomemarevinu.pdfIn PDF document text
    • http://pejonoma.epizy.com/49289978819.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/iron_diet_sheet_nhs.pdfIn PDF document text
    • http://gexazavere.epizy.com/sudupurekinukaxiwaba.pdfIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_1773b6cc6302469b8389a4fd60914b81.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_off0000cf56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF56 5624 bytes
SHA-256: 88783de2537d3c33421132248aecd9cd129ff64a2b34e46181e1eedf462dac20
font_01_sfnt_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 10640 bytes
SHA-256: 8291dd1a299028734055e20a04bb8707534f4f65d40affbd0f035f632ae35fb0
font_02_sfnt_off000106ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 16424 bytes
SHA-256: 4e33714b56110788a65b3ccccc86b33874f2ccf8e01c4b58923d0723bd0c6ca7

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