Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d75c57dd758845…

MALICIOUS

PDF

72.0 KB Created: 2021-02-27 04:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bdc17dd141821f721f22e2d48fbbbd90 SHA-1: 6f2cf8c6b23262f1ec94fb8cfea14646deccfb9d SHA-256: 63d75c57dd75884588ce674a50567e33f86290a82169e703e396cea8258f13a8
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/wb?keyword=breadwinner%20summary%20ch%205 PDF link annotation
    • https://cdn.sqhk.co/devepogisog/d6dijen/sukipaxesukef.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/fihgcYS/guviwarafox.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/air_force_academy_application_cost3zv27.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/xjbjahb/clumsy_ninja_gameplay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389104/normal_60254edb8b499.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483864/normal_5ffa8662c88ae.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/7Wid9gh/36966256886.pdfIn PDF document text
    • https://wijodemarivupi.weebly.com/uploads/1/3/4/8/134861972/5348f927d19.pdfIn PDF document text
    • http://flathead.us/29800493924rvpbr.pdfIn PDF document text
    • https://kurogokolazol.weebly.com/uploads/1/3/4/7/134751625/zejufoget.pdfIn PDF document text
    • http://white-x.fun/1319990397bk2vy.pdfIn PDF document text
    • http://aslixan.com/40447863208fmn72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446045/normal_600b4f1eb3be7.pdfIn PDF document text
    • http://espaceabonne.com/what_are_the_7_deadly_sins_in_order_biblezl2gi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472182/normal_5ff544434924b.pdfIn PDF document text
    • https://tabofeluraratub.weebly.com/uploads/1/3/1/4/131438776/5978176.pdfIn PDF document text
    • https://julogunakununu.weebly.com/uploads/1/3/2/8/132814048/4040004.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE35 5516 bytes
SHA-256: 72c5c973ef46aeeea505a7f8ff28d575918b8999a4f6fc1ecb133215c33258f6
font_01_sfnt_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 9840 bytes
SHA-256: c6e38963fdf650f53b8baffa707f9dcab0f741eca21168b5f3f950ff50300d88

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