Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2ca880c8666e1a…

MALICIOUS

PDF

79.6 KB Created: 2021-01-03 02:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e756eeaed6b330a3d825fbd8d7abeef9 SHA-1: 8327062560ee551d61fa0eec5c835c029e395f80 SHA-256: 2c2ca880c8666e1a8b8e88e78a6c82e08f92e43c7a94cc99933e4f236eead6ad
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 0.9997

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://traffine.ru/123?utm_term=goldeneye+mouse+and+keyboard+online PDF link annotation
    • https://tuwunujanopir.weebly.com/uploads/1/3/4/6/134617400/zifolobe-mosipafo-vixufijeja-fazejitelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5f87d197c8649.pdfIn PDF document text
    • https://rapowude.weebly.com/uploads/1/3/1/4/131454581/netojezeloz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488092/normal_5fac220820171.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/059d55fbff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418362/normal_5f9652014377c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_5fe9166c94734.pdfIn PDF document text
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/livofabu.pdfIn PDF document text
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/bojidijuwodefone.pdfIn PDF document text
    • https://faxegosesu.weebly.com/uploads/1/3/4/5/134528451/103debdec.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/damerirazib/molecular_geometry_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/lost_note_affidavit_form_florida.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_off0000f9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 5308 bytes
SHA-256: 66442e9e216071ff282a0e2c7a325335e0e30ff0353f02b9967788b8ad6ad7a1
font_01_sfnt_off00010ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 11152 bytes
SHA-256: 3d89d4252d3b75403d80e8388f07b6742e00ceb9c20b782dee2a0d738849de75

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