Malicious PDF — malware analysis report

Static analysis result for SHA-256 44fd4283e37a0369…

MALICIOUS

PDF

78.8 KB Created: 2021-03-18 10:09:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4dfadfb929f8729a0cc183da568f4aa9 SHA-1: ce1e70e826b3334f0521297b6f0bd8c2fefa1fa6 SHA-256: 44fd4283e37a03692f1a6251d3be778cb98d0f4084cb970fe8ee789581986039
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to potentially malicious or SEO-manipulative content. The ML classifier and ClamAV also identified it as malicious. While no scripts were directly extracted, the PDF structure itself facilitates the redirection to external URLs, suggesting an intent to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=earthquake+chipper+shredder+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368265/normal_5fe998fc82358.pdfIn PDF document text
    • https://vemekejafor.weebly.com/uploads/1/3/4/0/134012611/8478251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477655/normal_6044d99909ff9.pdfIn PDF document text
    • http://diluzadumavotux.getenjoyment.net/roman_numeral_worksheets_year_4.pdfIn PDF document text
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/sivedopugunun.pdfIn PDF document text
    • https://bagubabijotete.weebly.com/uploads/1/3/4/3/134319258/4eb1080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465559/normal_5fdcf258bcddc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459464/normal_5fcb7554c470c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_600fed599858f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367310/normal_5ff0322f4a838.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421767/normal_601de1cf3804d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451754/normal_5ff6936f8f0ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393035/normal_603759d1c9b68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_601f3f6cf27fd.pdfIn PDF document text
    • https://vipukawolatu.weebly.com/uploads/1/3/4/4/134486161/2680903.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380536/normal_5ffaaf4d87ebf.pdfIn PDF document text
    • https://mixusabap.weebly.com/uploads/1/3/4/0/134096097/2333427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486521/normal_601fa029cdf0c.pdfIn PDF document text
    • http://fesufobototezer.mywebcommunity.org/how_to_use_a_rational_oven.pdfIn PDF document text
    • http://tebeririz.scienceontheweb.net/7_split_merge_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piwakitidi.onlinewebshop.net/90674599591.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/88328860649.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/9914450256.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/32803364094.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/12522316743.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/tipos_de_motores_de_corriente_continua_y_sus_aplicaciones.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_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 5276 bytes
SHA-256: 31a3705a14a392fef4c6a4e1e97b437d809b88e67fc6d9340e2184c2506682af
font_01_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 11328 bytes
SHA-256: 9dc4cfdfc4c129312923f290510dff265fa57e42029d36a9c1922abc5a8141ae