Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1f9db9686dd4b9…

MALICIOUS

PDF

42.1 KB Created: 2020-05-21 08:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2491d8f78ec734baa215800e4eaac28 SHA-1: 1511d201b72a00645507ac0e64f7108c72923210 SHA-256: 2a1f9db9686dd4b9df0285710ef3e442574f882e7f7980a04486c9f75edc27fa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of embedded external links, a technique commonly used for SEO poisoning or to redirect users to malicious websites. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to these external URLs, reinforcing the attack pattern. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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 http://seizediem.com/uploads/1/3/0/6/130603944/130603944.html#ghastly+halfling+5e
    • http://covaair.com/uploads/1/3/0/3/130313391/pujogarikosukufeti.pdf
    • http://emergencytreeremoval.org/uploads/1/3/0/2/130270941/be820b8d5.pdf
    • http://uite-laba16.com/uploads/1/3/0/6/130620689/zexavusonimiz.pdf
    • http://brighteyedwonder.com/uploads/1/3/0/6/130605384/gekudodaz-jumux-gidizorebudeje.pdf
    • http://whatsneeded.org/uploads/1/3/0/7/130776580/73489cdbcfc5b.pdf
    • http://myrealestaterx.com/uploads/1/3/0/6/130604877/1349363.pdf
    • http://santacruzdistributing.com/uploads/1/3/0/5/130538981/75b246.pdf
    • http://ctirsolucoes.com/uploads/1/3/1/4/131483083/nabifogu.pdf
    • http://tucsonchesscenter.net/uploads/1/3/0/5/130539223/50b4b296.pdf
    • http://untamedappetites.com/uploads/1/3/0/5/130545742/ketiros.pdf
    • http://nationals2020.com/uploads/1/3/0/4/130488105/7b9f288.pdf
    • http://pandcra.com/uploads/1/3/0/5/130590569/libezujolak.pdf
    • http://elandinvestmentinc.org/uploads/1/3/1/4/131407665/032af.pdf
    • http://airantuzla.com/uploads/1/3/0/8/130814402/fomanem.pdf
    • http://group6teamadventureexercise.com/uploads/1/3/0/5/130588956/lusosamuden.pdf
    • http://ilievlab.de/uploads/1/3/0/7/130740492/6482698.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007981.bin
548ecdbbeeb1e4a65a1517b81152c6a03a77ae4321a30e17cf5c7807de3a21ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7981 10516 bytes

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