Malicious PDF — malware analysis report

Static analysis result for SHA-256 af62fd168ade7930…

MALICIOUS

PDF

85.5 KB Created: 2021-03-08 15:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5662a160acf7de60853559b45ee5c092 SHA-1: 1835e9ea1d007c11f0f19f8dfec40c296b4971c8 SHA-256: af62fd168ade79300c72143ab28243aea551ecbd6fd5e08212d2d63b5785c435
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the nature of the links suggests a potential for directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=bertold+ulsamer+pdf PDF link annotation
    • http://coins24h.com/organizational_structure_in_healthcarexx54i.pdfIn PDF document text
    • http://marifivelaj.mygamesonline.org/6298909442.pdfIn PDF document text
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/narukozifumero-wusib-lenomig.pdfIn PDF document text
    • https://fewibiwovenekip.weebly.com/uploads/1/3/5/3/135327418/nejapijolezodapulibe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489052/normal_5ffe28f62c0a7.pdfIn PDF document text
    • https://tiketutowiko.weebly.com/uploads/1/3/5/3/135345961/zobixasamut.pdfIn PDF document text
    • http://probmaka.tech/vetawesamn21oa.pdfIn PDF document text
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/d81dbc3c2ae7.pdfIn PDF document text
    • http://dapurixid.sportsontheweb.net/hp_7525_printhead_replacement.pdfIn PDF document text
    • https://ruzesemuzonasow.weebly.com/uploads/1/3/4/0/134017575/5d30a05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480590/normal_6036d353edac9.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/tafujununosufib.pdfIn PDF document text
    • https://xadutodibuj.weebly.com/uploads/1/3/1/1/131164520/tiwunudo-guvinaji-rujuluzovoju-womolam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373517/normal_5fc69cc8944da.pdfIn PDF document text
    • https://saxipapes.weebly.com/uploads/1/3/0/7/130738636/9ec4452700f1213.pdfIn PDF document text
    • https://bepixumute.weebly.com/uploads/1/3/5/3/135302933/bejaki.pdfIn PDF document text
    • http://eurostore.info/74316217694kz8gf.pdfIn PDF document text
    • https://wumaluko.weebly.com/uploads/1/3/4/7/134716396/nomixexosi.pdfIn PDF document text
    • https://dodanopo.weebly.com/uploads/1/3/1/4/131408738/1964633.pdfIn PDF document text
    • https://kijiwutexaji.weebly.com/uploads/1/3/4/6/134698992/fanewewelurikesekam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bugenerefajujus.atwebpages.com/los_atributos_de_dios_aw_tozer.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_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 5236 bytes
SHA-256: 1a5d10592c390d2aac6cc8681590402222fed7cd8e9e7e88e837c653d2e6a5fc
font_01_sfnt_off000124b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B5 11124 bytes
SHA-256: a89abdca0386546c3620f63d974f2f64425e128d302c9bdda0075864f513b5b0

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