Malicious PDF — malware analysis report

Static analysis result for SHA-256 810f5492f87fe5e7…

MALICIOUS

PDF

77.7 KB Created: 2021-03-10 08:27:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 65038172bf61c9c4eab8a879a323fa3f SHA-1: 547ea7437bf69339b820591e181162e9d32e2a97 SHA-256: 810f5492f87fe5e75af44659576e3f6d3a53611aa4cdb02d5e22b306c6118f0b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://pelibifir.ru/award?keyword=advanced+automotive+technology+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379219/normal_5fe5461f6ae77.pdfIn PDF document text
    • https://vozunekoba.weebly.com/uploads/1/3/4/9/134902797/8bec3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410459/normal_5ff7ce1e8f576.pdfIn PDF document text
    • https://nozasereb.weebly.com/uploads/1/3/4/4/134499995/lotetawufomug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376125/normal_6024b58615bd5.pdfIn PDF document text
    • https://navikeput.weebly.com/uploads/1/3/4/7/134755574/laruwebaxe-xuvugadore.pdfIn PDF document text
    • http://bluhgang.best/neligebumezokixdpsz.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/4695053.pdfIn PDF document text
    • http://xitnet.fun/notuf9z7ld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_602996ab88cdb.pdfIn PDF document text
    • https://xikewewojan.weebly.com/uploads/1/3/4/0/134095915/givopobaniwaj-gadadixotud-xejarosasega.pdfIn PDF document text
    • https://pafudufuwod.weebly.com/uploads/1/3/4/3/134326080/9478878.pdfIn PDF document text
    • https://xujufefar.weebly.com/uploads/1/3/1/4/131483110/3155884.pdfIn PDF document text
    • https://zodemabu.weebly.com/uploads/1/3/4/8/134896511/gorarara_bomasir_rakomijos_bulufawusibava.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388038/normal_600204b0ed568.pdfIn PDF document text
    • http://artelamp.store/36428862476ervv8.pdfIn PDF document text
    • https://famexowizesiz.weebly.com/uploads/1/3/4/3/134359716/9885252.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/accessories_for_motorola_ht1250-ls3d6lb.pdfIn PDF document text
    • https://takaweso.weebly.com/uploads/1/3/2/3/132302848/xiserepapopisapebad.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/punagilelabon/55371574007.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/b._ed_date_sheet_2019_kanpur_university.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/93841616261.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/aviso_oportuno_el_informador_guadalajara_jalisco.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/formulas_para_obtener_el_volumen_de_figuras_geometricas.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_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 5444 bytes
SHA-256: bfb757357c37a464317d2a8b8174aaa0c1bee4162ef4c631f470efa34b1e8215
font_01_sfnt_off000106d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 10068 bytes
SHA-256: 84b887bea02fc03e580263f4764b3d76c995a6afec089583dc3b9d91a871b059