Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2be4a60eb66139…

MALICIOUS

PDF

72.2 KB Created: 2021-06-14 21:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d387fb3a094ac33dbe87c2d4834a4bf4 SHA-1: 93bbc284f4f61d4763a9c096e5b853f79ddf9ad9 SHA-256: 9c2be4a60eb66139615058042a944812521bb3455337c03c9b4640fec984c851
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 0.9997

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://medvor.ru/pbw?utm_term=gof+harry+potter PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4454179/normal_60b710dd7febe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502464/normal_60bd5650cf508.pdfIn PDF document text
    • https://bogatogofaz.weebly.com/uploads/1/3/4/7/134705351/3550581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378381/normal_606599da75d17.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/fibimawejugigugazo.pdfIn PDF document text
    • https://sisebafob.weebly.com/uploads/1/3/0/7/130776599/3f83a8da07e50.pdfIn PDF document text
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/sazoloredodunudunu.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4478125/normal_60afea1bd0677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_6049c5617eff6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420602/normal_60072b0434acd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muxopal.pbworks.com/w/file/fetch/144470496/download_lagu_beautiful_girl_sean_kingston_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1e07229-5449-4ce7-889f-bc19b979cbdb/when_jesus_was_a_little_boy_lyrics.pdfIn PDF document text
    • http://pebegijopolo.pbworks.com/f/donupefujepipoviwinudig.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/w/file/fetch/144723084/detazurorazumubomabopos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a0fcc0-26e3-4715-b80f-72eff9052497/what_is_bpo_explain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef6eb958-c5c5-4996-86f9-a429c77f7460/how_do_you_write_a_social_science_research_proposal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a23c6bc-7e15-4205-8c23-c5a88958283a/kindergarten_worksheets_math.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/w/file/fetch/144418296/84172745489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49b88f17-d262-45f2-ac83-ec9f12009da8/umrah_guidelines_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b42162c6-3633-4a51-9310-950f8104d95a/71911763959.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_off0000ddc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC9 4912 bytes
SHA-256: a59acd707ed0f417ad98d73ddab7a0a2141bb414a5b6ed86b5b40bdebba1c47d
font_01_sfnt_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 10944 bytes
SHA-256: fb2ba7fe8f1ec3bb9f1f3215892d3d97fa55d5ddc1ba7bf2964ddd4f9e59c75d