Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d07571b35163e4d…

MALICIOUS

PDF

34.3 KB Created: 2020-06-24 07:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 581bac43b67694a6f696f7ef6de1bf7d SHA-1: f081b62bfccd9ae3d0c4d556628ca8f0d7551e1e SHA-256: 5d07571b35163e4d8dfc85dd84427b280ae55492b8f361ca5d23b12c9443697d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which appear to be part of a link farm designed to redirect users to malicious content. The document's metadata and body text suggest a lure related to 'Excel to PDF mail merge', indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a high-risk attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://autodiscover.buildingblocksplaycenter.com/uploads/1/3/0/5/130551927/130551927.html#excel+to+pdf+mail+merge
    • http://bjd.ie/uploads/1/3/0/5/130543092/ba488a.pdf
    • http://corporate.blondinenterprises.com/uploads/1/3/0/7/130739462/fojomariranegazux.pdf
    • http://hyepie.com/uploads/1/3/1/4/131406610/xozelenenan.pdf
    • http://ankelaterveer.nl/uploads/1/3/0/4/130492315/0c24ccb7cafd.pdf
    • http://redlinervp.com/uploads/1/3/0/6/130605078/jidulebok.pdf
    • http://monumentcabin.com/uploads/1/3/0/9/130969431/vewajete_parudumob.pdf
    • http://webdisk.shpoppyshawnsshmokedcheese.com/uploads/1/3/0/7/130775584/8446676.pdf
    • http://breez-air.com/uploads/1/3/0/8/130813588/jiwovilarura.pdf
    • http://kensleigh.com/uploads/1/3/2/3/132303282/1494311.pdf
    • http://sanfrancycles.com/uploads/1/3/0/5/130588185/rerovimelube_gejugobi_lupevofepo_bujugup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000498e.bin
dda942f81062d3d47453187ff849ad76c1a15cc64cd36f3b6cacc0f9a38bb5b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x498E 5004 bytes
font_01_sfnt_off00005a93.bin
611fd2fc3574d0c990cff6770f868d2dd57e8e76eb3a09c6a8ece15e64a5a327		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A93 9952 bytes

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