Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c520f8ceeb4d257…

MALICIOUS

PDF

78.2 KB Created: 2021-06-10 22:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 050ca77a2c6f4b87a973af0cc6a63a90 SHA-1: f471b9055ee771cee8dc192b2659724da834dd93 SHA-256: 8c520f8ceeb4d257542a8a9e70ef2b139413a4ef135a0883d8a8a0c2bd3f275f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://oniceh.ru/pbw?utm_term=roblox+hacks+2021 PDF link annotation
    • https://bosebekepomij.weebly.com/uploads/1/3/4/8/134870535/suwemifoj_gumudirapaz.pdfIn PDF document text
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/1851648.pdfIn PDF document text
    • https://lonojoxojiliw.weebly.com/uploads/1/3/1/4/131438577/gegiliberiloro-boraxiwenosebu-dazuforud-gevofasox.pdfIn PDF document text
    • https://bajepexalotatif.weebly.com/uploads/1/3/4/8/134851886/kazeme.pdfIn PDF document text
    • https://tuniforokot.weebly.com/uploads/1/3/2/6/132682883/letabe.pdfIn PDF document text
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/febegizi.pdfIn PDF document text
    • https://luderokuva.weebly.com/uploads/1/3/5/3/135325165/461cb43c858f59.pdfIn PDF document text
    • https://pigaxapi.weebly.com/uploads/1/3/2/8/132815084/732eb0aa8c5f0.pdfIn PDF document text
    • https://wajajudamivigo.weebly.com/uploads/1/3/4/3/134359543/xexalobalad.pdfIn PDF document text
    • https://sedawuxel.weebly.com/uploads/1/3/5/3/135326539/fc39af9a76c576e.pdfIn PDF document text
    • https://pitimonajavigo.weebly.com/uploads/1/3/1/3/131383860/wosorubaturobid-xepobe-tirunok-batediwanoke.pdfIn PDF document text
    • https://lisijinawap.weebly.com/uploads/1/3/4/7/134740049/6823a687fd35454.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487386/normal_5fefbbb4c9892.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4462066/normal_60b04a6020bc7.pdfIn PDF document text
    • https://tenaxegib.weebly.com/uploads/1/3/4/5/134583113/b5c69339a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5724b265-1dda-4ba6-b64c-9941d78cf799/pokemon_desmume_black_screen.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/w/file/fetch/144440628/92731296137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89bf04b2-c55a-4c50-9dad-43fa2856647b/wurojoj.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144422955/benvolio_and_mercutio_relationship.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 4832 bytes
SHA-256: e0775e416eeae84cfd842a801558340447461dd2c7252a01896b6863160280c8
font_01_sfnt_off0000f96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 10712 bytes
SHA-256: ea92348cdd1132e6f01d4e9c37545b66897583b8d02c783966927e5d87ad6224
font_02_sfnt_off00011db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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