Malicious PDF — malware analysis report

Static analysis result for SHA-256 e935fe35be2cd857…

MALICIOUS

PDF

70.0 KB Created: 2021-03-25 01:24:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 71b8ee6ec05529f78cd69cfbe79c4506 SHA-1: 91db0026402f8a9bd315ceb75b59661d7f64a304 SHA-256: e935fe35be2cd8579c97e369f6762e5878e28af3484d184c4df8bbb673cba490
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 0.9997

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://mezovuduw.ru/award?keyword=oxford+beginner+s+chinese+dictionary+pdf PDF link annotation
    • http://dumubemajizukov.medianewsonline.com/night_shift_jobs_hiring_asap.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/degolorumakepikudajateri.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/wahl_clipper_guards_size_16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474211/normal_6001174e5e114.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/accounting_concepts_and_principles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382781/normal_5fd7d6a817faf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464720/normal_60009dea9c5a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495391/normal_602aa207d2560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493876/normal_60340046d435e.pdfIn PDF document text
    • http://liberum.sportsontheweb.net/constructive_anatomy_george_brant_bridgman.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/dozore/chatrapathi_movie_tamil_songs.pdfIn PDF document text
    • http://kutoxinupuroxo.onlinewebshop.net/lina_khan_amazon_antitrust_paradox.pdfIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_e5c42947506744ff81ce048132acb82a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gonima/11988420240.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/3783593638.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/gogiwowalaluzunogig.pdfIn PDF document text
    • http://gegurobaz.myartsonline.com/catlogo_hinode_ciclo_2_2020.pdfIn PDF document text
    • https://7322f44d-5cb7-45f5-8521-a79093f6ce74.filesusr.com/ugd/dd0890_bb76abd8d31e449786284920dd0dcd20.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_5a60cb4ad0d442c3ab69d8621121df27.pdf?index=trueIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/jefot.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/fibuwanufumog.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_off0000d35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35A 5724 bytes
SHA-256: 27ec2d45f8e1d3f628d6ba67caaacca5abc226a7409382ecf0184df57a43d7f9
font_01_sfnt_off0000e6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 10564 bytes
SHA-256: 03038ea671a8878c4cfdb15bda249ac1f9605bffa5fefd2fd5890262fced45c9

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