Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53b07d3a5483bf0…

MALICIOUS

PDF

75.5 KB Created: 2021-04-10 22:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: aebde3a125c596fef5beab2cae62e711 SHA-1: 207c9dad37cad780d0996dbfb8211653930f86c2 SHA-256: c53b07d3a5483bf0ae5f97d42e88a972b45c1ed7b5c07f67326ede72e358a66a
194 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to distribute malware or phish users. The presence of a 'download' lure and the ML classifier's high confidence score further support malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/strik?utm_term=the+canterville+ghost+1996+full+movie+download+in+hindi PDF link annotation
    • https://lovefuzabuzonif.weebly.com/uploads/1/3/4/1/134109130/24d8ad.pdfIn PDF document text
    • http://runmasten.online/ancient_japanese_sword_fighting_styles559jl.pdfIn PDF document text
    • http://passive-income.ru/fopukubujubapud5kl45.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/guiaLKl/messi_crazy_free_kick_vs_liverpool.pdfIn PDF document text
    • http://fruktovik.com/color_chat_discordee8tq.pdfIn PDF document text
    • https://nasuvanebi.weebly.com/uploads/1/3/5/3/135393195/6229373.pdfIn PDF document text
    • https://jevokave.weebly.com/uploads/1/3/4/2/134266272/manapoxeba_zupimiwebivufu_xadipa.pdfIn PDF document text
    • http://wisecreditscore.info/dutuzemamemurum6k1l.pdfIn PDF document text
    • https://cdn.sqhk.co/zevijevam/njiHBjc/23822575671.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/c7WCgc6/bowakipurepogesozirunu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_95610537d55942d19af62ed67b166219.pdf?index=trueIn PDF document text
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_8a03c46c920148b8bd0317158b92842d.pdf?index=trueIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_82b81ac668d24bec92fbece101d14a04.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ginutu/bunaja.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/56824417229.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/tibavukarodaguruzogomofu.pdfIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_284203421abc42e383c6830e6a301d9e.pdf?index=trueIn 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_off0000e824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 5896 bytes
SHA-256: 1095196bcbb606183d08637e04ffec5be7e0b3db6a48151491809b73921dea37
font_01_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 10676 bytes
SHA-256: 96044eabbd48373030c9699ade484edd68b8552c72fce6716503e5d6adb14ed7

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