Malicious PDF — malware analysis report

Static analysis result for SHA-256 0373daccd9aa2774…

MALICIOUS

PDF

87.0 KB Created: 2021-03-24 07:18:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 01e717bf6a75385fc9e254b279088cb0 SHA-1: 3d7c58941a008883f3d1364df48dc81e7056f63b SHA-256: 0373daccd9aa2774a148e46ece047e3185c9fd33cb2e17a3b0f074bb384728fc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to unknown or potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript to facilitate redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/123?utm_term=baseus+encok+s17+manual PDF link annotation
    • http://idealica-ufficiale.site/how_to_use_adobe_writert97xx.pdfIn PDF document text
    • http://zalavsky.ru/tifexoszqfn7.pdfIn PDF document text
    • http://opensalon.xyz/mumagosidewibotaletiglg55j.pdfIn PDF document text
    • http://bugosegu.scienceontheweb.net/lixuzinugilaretoruroruxa.pdfIn PDF document text
    • http://xatovapotogu.mywebcommunity.org/lubuxogotano.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/minegikukovel/background_eraser_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/19426988717.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_258f4657d79a4128bc7755553df83944.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dezajok/43136015190.pdfIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_a4a6baf1adbb48ceaca517ffde6bf1e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/10465932920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50aa504b-4807-42e3-a0ff-7ba1890895ad/linking_verb_list_of_words.pdfIn PDF document text
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_746abbd49cb84ce58209d2c058abb6dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aacaeb4-a346-4368-bd6a-0db910c57611/zujumawibodarobi.pdfIn PDF document text
    • http://vubuzixefixa.onlinewebshop.net/blog_de_libros_18.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/famous_books_and_authors_list_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/definite_answer_meaning_in_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/zolugojezevoza.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/lunixajemefovitebar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2723827b-9fbe-4c1e-8145-252d7fee4138/80439826974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82415587-f061-479a-9dbb-ca8c6a8f03fe/bomuguroxabe.pdfIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_bf3cace19e084a38b02ae056ec28825a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/garorowa/78827303088.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/cideb_le_fantome_de_l_opera_answers.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11427 5096 bytes
SHA-256: 77e5009e0d3b6b93ba180cf15039d042d64464f5d7d86e425c938af8addb6eb9
font_01_sfnt_off0001257c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 11512 bytes
SHA-256: f51cb418dbf43f0a7ae603ef74d15a6e60f5320730a013280dd5e4adc007c940

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