Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac695b3eb888e00b…

MALICIOUS

PDF

76.1 KB Created: 2021-03-01 11:48:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4365f756d9a87c6ed5d9034d5aa51ca2 SHA-1: df67f091c1a86d60cb20ea6f3c8ff184de7b79e4 SHA-256: ac695b3eb888e00b642bcea8f00c6a4cd894ec8126e13910c111300cfcbd9b56
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'Books silence of the lambs series' and authoring application details, which are likely used to disguise the malicious nature of the document and trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jottigo.ru/wb?keyword=books%20silence%20of%20the%20lambs%20series PDF link annotation
    • https://degiviwab.weebly.com/uploads/1/3/2/6/132680905/10a35e5d1f.pdfIn PDF document text
    • https://tomosuboma.weebly.com/uploads/1/3/5/3/135382902/dotet.pdfIn PDF document text
    • http://baykamif.space/tizipay6x1a.pdfIn PDF document text
    • https://cdn.sqhk.co/bijukipuj/UhVheih/nalotu.pdfIn PDF document text
    • http://rubeatyshop.xyz/lutisefopolubajixuwp9o6r.pdfIn PDF document text
    • https://nipodixosun.weebly.com/uploads/1/3/4/4/134494364/cac378c0f408.pdfIn PDF document text
    • https://cdn.sqhk.co/lexelinowe/QidXihi/27851567624.pdfIn PDF document text
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/ffa79ba4ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410448/normal_5fed49a7c9d42.pdfIn PDF document text
    • https://cdn.sqhk.co/tarolaser/vhe6hjX/38092107556.pdfIn PDF document text
    • https://xuxijoma.weebly.com/uploads/1/3/3/9/133997678/kewewudovapugez_baxavojugezadoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427523/normal_603323d4e6934.pdfIn PDF document text
    • https://tilavulam.weebly.com/uploads/1/3/0/7/130739056/e73d0eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464055/normal_5fd7374c4dba6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498978/normal_603be5aa885dd.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/A17Hgfn/73677104893.pdfIn PDF document text
    • https://vixevugipun.weebly.com/uploads/1/3/5/3/135327752/3232532.pdfIn PDF document text
    • https://cdn.sqhk.co/kezavilageg/hcjihdL/zapebakabikudepububogaw.pdfIn PDF document text
    • http://info-pages.ru/headache_diary_printablea5f0r.pdfIn PDF document text
    • http://ideaita.fun/xuxenixuxoneriwototatemi85a4o.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_off0000e9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 5376 bytes
SHA-256: b7ce42e168ad389137de68fce964cb1300214712731f8b002086f77c8cff0e5b
font_01_sfnt_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 12544 bytes
SHA-256: 3cde0949e21d7c8334df0883b60f751828d55d60210dffe06ccbb13d762b99c1

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