Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bff68f75fecfbb…

MALICIOUS

PDF

80.3 KB Created: 2021-05-31 16:39:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 825aab076968fdd492f1e950913d2003 SHA-1: 9763e5394fdb65b989e807026a1f3aec22f8d933 SHA-256: f3bff68f75fecfbb5b76490a40b2e82fc9d0e3e900e4af698d31516463371610
186 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 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://druttle.ru/123?utm_term=english+grammar+revision+exercises+answers+pdf PDF link annotation
    • https://zaduguwage.weebly.com/uploads/1/3/0/8/130874015/rusowixul-wuzovugut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366032/normal_5fe06d53b2fa1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459636/normal_5fde6e809ca16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495393/normal_600f65164e24f.pdfIn PDF document text
    • https://moremutinujiti.weebly.com/uploads/1/3/4/8/134865562/jijewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489441/normal_60688cb3ad93d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369168/normal_60263ff7b53aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451363/normal_6052e79189754.pdfIn PDF document text
    • https://vuzupugum.weebly.com/uploads/1/3/1/4/131453250/f91b19095be01.pdfIn PDF document text
    • https://pifilapife.weebly.com/uploads/1/3/4/3/134376120/6346890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_606cc94c2c3e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426941/normal_604de545eb1bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464720/normal_5ffae45969a43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380887/normal_604cf71fb8f5f.pdfIn PDF document text
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/2d6f600f152.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedetuwi.pbworks.com/f/5942055893.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144413808/usa_today_up_and_down_words.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144412419/quality_function_deployment_and_six_sigma.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144412593/percy_jackson_books_online_download_free.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_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 5748 bytes
SHA-256: c739ea8ffa7e578b568354b41e2b2a68516fb81e40298c34501e5fec2d836c87
font_01_sfnt_off00010ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE4 10824 bytes
SHA-256: 5f0ff02199ecef458fd0db45e8a076832720344fe788444b80876eb4e0781f4e

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