Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b0ddd020a234c0…

MALICIOUS

PDF

75.3 KB Created: 2021-02-28 08:26:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f37618750c4b2771c5b6ec7dc345609b SHA-1: 2324700eb4039a1b4718df6c6cd0c5795f22220e SHA-256: 16b0ddd020a234c07c520d29ad0c06468d71ebc538298fe77047bcfd7f559adf
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicative of a link farm designed to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

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/strik?utm_term=how+to+complete+form+1003 PDF link annotation
    • https://xaforegitada.weebly.com/uploads/1/3/1/4/131413040/xirejamimipegid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470221/normal_5fea21f49e175.pdfIn PDF document text
    • https://lizitizesibegip.weebly.com/uploads/1/3/4/6/134685526/8239439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447467/normal_6031f6ac006e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_6013bf413a064.pdfIn PDF document text
    • http://mnogolidov.xyz/ejercicios_para_crear_tablas_dinamicas_en_excel29wdk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486548/normal_603b04415bf99.pdfIn PDF document text
    • http://lnstagramsupportingcenter.com/molecular_biology_and_evolution_citation_styleyithm.pdfIn PDF document text
    • https://vesitunerenos.weebly.com/uploads/1/3/5/3/135338192/lepoxotarenejoji.pdfIn PDF document text
    • http://abanca-electronica.com/38774701423t2bkw.pdfIn PDF document text
    • http://poroda.site/tawamibawofspvoy.pdfIn PDF document text
    • http://cosmeteca.com/sources_de_lumires_colores_1s_exercices_corrigs96xqh.pdfIn PDF document text
    • https://lizatupapej.weebly.com/uploads/1/3/4/4/134401074/reweg.pdfIn PDF document text
    • http://yachts-4-sale.com/geology_notesb2t94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394060/normal_5ff04850a2ad9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nonabafat/76039267247.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/to_be_past_simple.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/51829495709.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_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 5184 bytes
SHA-256: 3dcb8214d4294e92f98cd36ce1e68c19d10cc16ecb7095b55c1418f07c0dff63
font_01_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 10460 bytes
SHA-256: ef5a97605b7db6457fbd36c2557b2f59a1fec7ed45aae49e77b9609cda7aa134

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