Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0bf21b1a5cf915…

MALICIOUS

PDF

108.2 KB Created: 2021-05-28 11:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2f3a66c57f7d28bf43ca5e3598a81aa6 SHA-1: 29d289fc44da6565bd4adf521f0b7a1c077a1195 SHA-256: 5c0bf21b1a5cf91589afbc0823ee0e866db6662546dae30953d15de364baf624
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by multiple heuristics and an ML classifier, and also detected by ClamAV as Pdf.Phishing.Trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm likely used for SEO manipulation or to distribute further malicious content. The presence of external links suggests an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=the+lion+the+witch+and+the+wardrobe+summary+chapter+15 PDF link annotation
    • https://sokarapojuler.weebly.com/uploads/1/3/1/1/131163736/7790362.pdfIn PDF document text
    • https://koreperuk.weebly.com/uploads/1/3/2/6/132680900/tanusixefudipirazitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426407/normal_5fda0d2c26ff7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476936/normal_6053387bab30b.pdfIn PDF document text
    • https://jofovavugelizud.weebly.com/uploads/1/3/4/8/134855980/797042.pdfIn PDF document text
    • https://suwanozafedo.weebly.com/uploads/1/3/4/5/134587456/8524499.pdfIn PDF document text
    • https://loxutagunepolu.weebly.com/uploads/1/3/4/7/134763456/5205219.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426549/normal_600299e2c1abc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473359/normal_5fee7dad7c03b.pdfIn PDF document text
    • https://nakebakij.weebly.com/uploads/1/3/5/3/135339599/wasosinitikimofujoro.pdfIn PDF document text
    • https://lekifusa.weebly.com/uploads/1/3/1/3/131382118/3811950.pdfIn PDF document text
    • https://nubokulusavabum.weebly.com/uploads/1/3/4/7/134702007/1fb702200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_602042c2d5473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454678/normal_60365e419d0bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_603749d83a3cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414334/normal_605b16fe65a0f.pdfIn PDF document text
    • https://kezugavamatuwe.weebly.com/uploads/1/3/5/3/135347357/xekov-ginojivisagesow-kubaxedef.pdfIn PDF document text
    • https://bijafifevidajun.weebly.com/uploads/1/3/6/0/136051066/sazatijogadig.pdfIn PDF document text
    • https://vegipojefatelon.weebly.com/uploads/1/3/4/8/134876486/0d9536c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423750/normal_602d5f665361d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465018/normal_5fd6280823ab8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371244/normal_5ffccc76d9ca3.pdfIn PDF document text
    • https://vunubudewodazuz.weebly.com/uploads/1/3/4/3/134340329/6451304.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15956 5652 bytes
SHA-256: 1d515d9d6ac9d9a12d02c5cbe797b89ce309e1cb6c20c3c7ae81923bf105221c
font_01_sfnt_off00016c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C72 11412 bytes
SHA-256: 6fbd5dd3b4877e34543647c710451d1681842989e61c4d3f9f41da81cc547503
font_02_sfnt_off000192f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192F3 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3