Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee0cb2967a1951a9…

MALICIOUS

PDF

75.9 KB Created: 2021-03-17 10:07:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 71ee2ac210e13607740a027321280f34 SHA-1: 111e97db09699bc1617e0e55e97a61323ea4586c SHA-256: ee0cb2967a1951a962cd0106c9d3c07b6d87af16ea3ca633854b9df910f49ca8
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, many hosted on disposable domains like Weebly, suggesting an attempt to distribute malicious content or engage in SEO spam. The presence of PDF-specific heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment.

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://zajinet.ru/123?utm_term=bathroom+design+app+android PDF link annotation
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/e69e3bedd5.pdfIn PDF document text
    • https://vumirexow.weebly.com/uploads/1/3/2/7/132740730/4965942.pdfIn PDF document text
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/dijidelobuf_mokifixowotizu_romubegukiwi_daridukis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_6023f9eae8a56.pdfIn PDF document text
    • https://kagujovo.weebly.com/uploads/1/3/5/2/135298661/9599065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501041/normal_601b567107b30.pdfIn PDF document text
    • http://fastpeysistem.online/demavusovadq0lnr.pdfIn PDF document text
    • https://kekiwudegabute.weebly.com/uploads/1/3/0/8/130813612/lobidozabi-rimilidawaju-kavojerazox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450139/normal_600dfde429ff0.pdfIn PDF document text
    • http://samaraexpo.com/4352770883giebk.pdfIn PDF document text
    • http://ecoservice-vlad.ru/google_analytics_academy_study_guidesav84.pdfIn PDF document text
    • https://murufirekitopu.weebly.com/uploads/1/3/1/8/131856476/19eff7ffe30ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375525/normal_5fcc840a37400.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/295a6e47-ee93-44e9-bd3c-79fb097e6426/xazofolobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a482ba85-83d4-4288-84c6-f57a0ed85b23/nesezaxolegorilugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91f2f200-f330-4d65-a65f-3698d2ce53df/3272954360.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/hackett_blazer_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/ozark_missouri_weather_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1492a49-6a99-4d37-8350-5e7736fd5881/ejemplos_de_guiones_obras_de_teatro.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/vemezisazuzedemafisawez.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_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 5392 bytes
SHA-256: 22be951de5380fb9a5d5027372126d42b107d82fc37298e9933cf1a344998486
font_01_sfnt_off0000ff51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF51 10380 bytes
SHA-256: f68bad89a58987f32b8f2cc41e543f0931bd6221d6c2ee857c4f391d9d144e73