Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b68632af88151a…

MALICIOUS

PDF

81.6 KB Created: 2021-04-04 00:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 340b1f6b84b971ed1e555fa695833b3c SHA-1: 5d710ace6f675db29f1d2ccddfe4be3c8c8c0e49 SHA-256: a1b68632af88151aa059540c83fdf4c420d227c1744c63faead4dcd4824cad59
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 0.9996

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/award?keyword=bruchrechnen+aufgaben+mit+l%25C3%25B6sungen+pdf PDF link annotation
    • http://hocostyle.ru/sikoxavajobixetuoyc28.pdfIn PDF document text
    • http://gogotmif.space/dadenenutajamapyf070.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470542/normal_5fca00f106da8.pdfIn PDF document text
    • http://study-english-04.space/15191099310xu48t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424985/normal_5fd139649d071.pdfIn PDF document text
    • http://ca-management.website/95486380263bt30h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_604f55a238ccb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365542/normal_5fc6de2243e6e.pdfIn PDF document text
    • http://italywow.info/91688779037tg2d5.pdfIn PDF document text
    • http://hookup671.site/3965509990vs8m2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_9e3cbff76ab941b0b30cbe6580335642.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/posufij/foreign_currency_value_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/teorema_de_moivre-laplace_para_probabilidad.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/51396277651.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/29929879178.pdfIn PDF document text
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_ef0cef6fa8d241d8b57553ae4b18d2f3.pdf?index=trueIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_7248c58bf38c4707baf0c941a3db6c7e.pdf?index=trueIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_62932d4a33cb42438ebf6e70f1afbb6a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dumupa/car_driving_games_apk.pdfIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_0a2c1975ce8f48f697b32c026e0abc08.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_135c361e4c1941c6aa0d200715b45edc.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_off0000e91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 5896 bytes
SHA-256: 6ca8c0535317cad7486737aa098ecae7bbfb6c9388005da5efb6def087b9dea5
font_01_sfnt_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 11032 bytes
SHA-256: 271b3e5af420ee0c03367665dee3ec9341c422410c8351424c1fa39481c91e42
font_02_sfnt_off00012192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727

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