Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f57d53988a6254f…

MALICIOUS

PDF

83.1 KB Created: 2021-03-15 16:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 090bef17458dfc1c9d8fc83a88b8e39b SHA-1: 568febb88bbae8c830b42918bea786a43a49c5b8 SHA-256: 2f57d53988a6254f7acb262b13fb433daf462d752fd9cd0fdc11de4a8fb466a0
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 0.9998

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://dafemum.ru/award?keyword=free+download+pdf+reader+for+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403140/normal_604c9ad073ae6.pdfIn PDF document text
    • http://ostanni.fun/data_analysis_techniques_in_researchekiqm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455380/normal_6006fedecb4f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463808/normal_5fe633950caa0.pdfIn PDF document text
    • https://rizipotekam.weebly.com/uploads/1/3/4/6/134639676/tavogevape_tudisererak_nirapizedin.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/66391749811.pdfIn PDF document text
    • http://tejidirexe.mywebcommunity.org/61256982388.pdfIn PDF document text
    • http://voirly.xyz/1877932816043wwi.pdfIn PDF document text
    • http://wegansit.space/ar_reading_list_for_3rd_grade1pi9m.pdfIn PDF document text
    • https://kabirajozef.weebly.com/uploads/1/3/2/7/132740353/xazedimafag.pdfIn PDF document text
    • http://dmdmassage.com/zavuwetetezipififelouunk.pdfIn PDF document text
    • http://adachivia.store/wixivipusijupuruferekemesk3q5v.pdfIn PDF document text
    • http://tamakar.xyz/83499616636rt651.pdfIn PDF document text
    • http://unlockdeals.shop/ap_3d_studio_art_concentration_ideasgeqz0.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/tesapibebujep/9129337307.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/adobe_3d_export_to_step_freeware.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/83733694791.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/deductive_argument_forms_philosophy.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_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 5020 bytes
SHA-256: 50d5bc572a305ce14d7560d77d0b8bb60bf13e435d4bda094d848bd3ef0d8937
font_01_sfnt_off00011a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A20 10760 bytes
SHA-256: a3b0267f95b0b0e49f02dbe23f6facb6b291e1e2eeb66a704f1189efcb5436ea

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