Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b71e4363ec44995…

MALICIOUS

PDF

75.8 KB Created: 2021-02-16 06:56:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a232b36a54fcb1945c0df3a94441afa7 SHA-1: fda4934590fd7d5d18c2de9fbbb293b22766f48f SHA-256: 2b71e4363ec449955c5200cd2c3ccc0d8394c95e4eff6f8c60e4d2ca8d772cb3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many of which point to SEO-optimized content, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, likely spearphishing or SEO spam.

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/strik?utm_term=my+pet+dog+essay+for+grade+2 PDF link annotation
    • https://cdn.sqhk.co/mofipife/hcmAgfi/spray_fast_stencil_art_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/ShhKiiq/81862877158.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421199/normal_5fee714c7a084.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492546/normal_5fe3410fec69a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489257/normal_6022c3983c78b.pdfIn PDF document text
    • https://cdn.sqhk.co/jisepozidis/Zgijchf/fight_polish_card_games.pdfIn PDF document text
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/nezusexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499282/normal_602a2749cb08f.pdfIn PDF document text
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/miwej.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/CgjrNP9/how_to_hack_online_games_android_2020.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/mixanaz/pimosejowovu.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/rg_astraea_type_f_manual.pdfIn PDF document text
    • http://velizufilalate.epizy.com/wegodesozozunes.pdfIn PDF document text
    • http://vikogen.epizy.com/vscode_format_code_css.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/taize_alleluia_sheet_music.pdfIn PDF document text
    • http://voginafukut.rf.gd/hfss_antenna_design_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/maworapatibu.pdfIn PDF document text
    • http://vadibezodaxilez.rf.gd/calculating_gpa_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/psp_emulator_apk.pdfIn PDF document text
    • http://xuxuparozit.epizy.com/24918249844.pdfIn PDF document text
    • http://funedoja.epizy.com/79422552660.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_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 5416 bytes
SHA-256: d32f79c130bc675d32d5c04261bd4cc5adc0fd15bc0d622d847367c740c32c08
font_01_sfnt_off0000ff51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF51 10108 bytes
SHA-256: 05f39f54ed0bb08cb2b88f9b9c279477ba9556bf9cd9f72dbe06d44191b1a9b5

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