Malicious PDF — malware analysis report

Static analysis result for SHA-256 529b79f3ce649a23…

MALICIOUS

PDF

77.4 KB Created: 2021-05-24 20:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2878068f882b13a8cf1ea5115a77e65d SHA-1: 3dce521af8f94aa26c0849541a9fd5c47961a72b SHA-256: 529b79f3ce649a239caeacb01a8e38c4e6ab16b4200b747d1d60fe6fdebde591
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, indicative of a link farm or SEO spam tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing or trojan delivery. The embedded URLs likely serve as lures to download further malicious content or phish for credentials.

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://kuzutuzo.ru/strik?utm_term=%25C2%25BFqu%25C3%25A9+es+una+metafora+y+ejemplos+para+ni%25C3%25B1os PDF link annotation
    • https://gisijenoxumo.weebly.com/uploads/1/3/1/4/131437849/120203.pdfIn PDF document text
    • https://fokifukamanur.weebly.com/uploads/1/3/0/8/130874497/megazi.pdfIn PDF document text
    • https://lofuniwap.weebly.com/uploads/1/3/0/8/130874201/gilipugesimovu-giwivazez-wapamumibejoma-kexodopedeko.pdfIn PDF document text
    • https://sugulone.weebly.com/uploads/1/3/2/7/132740418/wujel-gegopojaridis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405946/normal_6016cf77619b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414486/normal_5fe4757db0d1e.pdfIn PDF document text
    • https://famalekirujapa.weebly.com/uploads/1/3/1/4/131453917/9f21dde98f03d.pdfIn PDF document text
    • https://dadazifetulo.weebly.com/uploads/1/3/0/9/130969312/kasizi-fuwigetokuli-zafuzi.pdfIn PDF document text
    • https://zuwuroxiver.weebly.com/uploads/1/3/1/0/131070979/xidapo-fumak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412174/normal_5fc74cf13c732.pdfIn PDF document text
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/c31d34d8477ab0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497368/normal_5ff6c81d90188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485152/normal_6017344f1797d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408712/normal_5fde8c6918ebc.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/vuxirefare/tascam_dp-03sd_8-track_digital_portastudio.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/apc_smt1500nc_smart-ups_1500va_lcd_120v_with_network_card.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/winrar_windows_10_32_bit_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/lesson_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/maven_webapp_example_eclipse.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/comic_box_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/27242562982.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/cuanto_es_100_metros_en_pulgadas.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_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 5748 bytes
SHA-256: 5e1ed0d771114ca65afde8fb82d8eb4ef7eea714097afce4c883b1c070fea273
font_01_sfnt_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 10464 bytes
SHA-256: 41a5ebc1c977b3bf51dd9db76e5b17c073afdf89582354cc4e73f72e0b417b15

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