Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd9c532967e6224…

MALICIOUS

PDF

82.8 KB Created: 2021-04-07 02:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bf31ccab479e3454147213d2eea4cd00 SHA-1: 1094233e918bda90021fd53771878af28a1a0e72 SHA-256: 9cd9c532967e6224e1c215414d4651921236213540798f9364837e475034fdca
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 0.9970

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://nipisod.ru/123?utm_term=basketball+agility+ladder+drills+pdf PDF link annotation
    • http://kusafomidufe.mywebcommunity.org/26708431738.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390681/normal_5fec07dbcb77d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446270/normal_60640139ec30c.pdfIn PDF document text
    • https://zitenimed.weebly.com/uploads/1/3/1/3/131383388/0a8679.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/topezuxazazulurojarize.pdfIn PDF document text
    • http://podarokinsta.site/descargar_libros_tres_metros_sobre_el_cielo_gratisgt5b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420454/normal_601d916c59476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_60353e7dd039e.pdfIn PDF document text
    • http://gomesuzos.mypressonline.com/what_does_chi_mean_in_chi_st_lukes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457868/normal_60544397ce72e.pdfIn PDF document text
    • https://vakozumemarob.weebly.com/uploads/1/3/1/0/131070483/pekilitora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455894/normal_60432ce912539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409122/normal_5fe6403e25e44.pdfIn PDF document text
    • https://munujagafunudo.weebly.com/uploads/1/3/0/8/130873736/0f6073246dcd4.pdfIn PDF document text
    • http://hdvideo.design/pasekosumeruzunetobfe3qf.pdfIn PDF document text
    • http://wirelessinfo.ru/romeo_and_juliet_leonardo_dicaprio_trailer_itada5sm.pdfIn PDF document text
    • https://neruzubegakakew.weebly.com/uploads/1/3/4/0/134017499/697271b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_603183b2134a9.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/what_are_the_100_most_common_spanish_words.pdfIn PDF document text
    • https://bipilebel.weebly.com/uploads/1/3/1/6/131606150/tepokufib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444864/normal_5fee9b5712535.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_ccc51e79cfbd4b5893f88cf9dc88d529.pdf?index=trueIn PDF document text
    • https://e24ff460-1725-4b9d-a7de-f8438c38fea0.filesusr.com/ugd/366850_a3bd4e8f252646349630a15f94e4aec9.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_76c4b3291d4045bc9ff8be1d86d5865c.pdf?index=trueIn PDF document text
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_c968b35f6f6f4024881b5fa1981a694a.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_8a527368c6544226843bf48e53c4675d.pdf?index=trueIn 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_off000103ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 5564 bytes
SHA-256: 2985833fd1bdf0983e83cfa88f97c156535b8df89aeced8aa655aff81f80c749
font_01_sfnt_off000116c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C2 10868 bytes
SHA-256: 6ada14100c19c9ab00fe4bdc92c54d6da45deedc628d61cf2a79eaf3c3f9a069