Malicious PDF — malware analysis report

Static analysis result for SHA-256 040251b55738ec0e…

MALICIOUS

PDF

37.4 KB Created: 2020-03-25 11:51:43 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6178870f9f950931f7510e3806b07b3a SHA-1: 9cf051b6cb18dd5cd7080f61f7be5eb624854f61 SHA-256: 040251b55738ec0ea6bdb841b92ce440d77f2521c1057a7bb58658c1646294c0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, also contains a URL that appears to be part of this link farm. This suggests the primary purpose is to direct users to a large collection of external resources, likely for SEO manipulation or to host further malicious content.

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://scrubs4work.com/uploads/1/3/0/6/130603858/130603858.html#best+english+learning+app+for+free
    • http://www.elitebodiifitness.com/uploads/1/3/0/3/130379506/wumugomagiwuwaxok.pdf
    • http://cassandraengeman.com/uploads/1/3/0/6/130620729/59121fb47ffad.pdf
    • http://bluepalmtoo.com/uploads/1/3/0/6/130621666/4ed73a.pdf
    • http://mta-sts.vtk9.com/uploads/1/3/0/5/130588731/woxonekamodawewepat.pdf
    • http://weintegration.com/uploads/1/3/0/2/130270941/bufeti.pdf
    • http://innesskirkna.com/uploads/1/3/0/2/130289541/jetuxifupepezoresik.pdf
    • http://soundcityreading.com/uploads/1/3/0/4/130476242/zemanulo.pdf
    • http://zeaglermusiconline.com/uploads/1/3/0/2/130287281/279f9618df.pdf
    • http://motorheadtv.com/uploads/1/3/0/9/130969177/5786576.pdf
    • http://mx.mhsdesigns.net/uploads/1/3/0/5/130551124/916110c1c1.pdf
    • http://acheevo.com/uploads/1/3/0/4/130488749/3844582.pdf
    • http://www.nicolleespinal.com/uploads/1/3/0/6/130604575/zumenig.pdf
    • http://jandgwarehousing.com/uploads/1/3/0/5/130540507/mokeju.pdf
    • http://www.eighteen-76.com/uploads/1/3/0/7/130775002/5b76395b72c65.pdf
    • http://www.cannapetmeds.net/uploads/1/3/0/5/130550930/dapisikodimaw.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_off000069f7.bin
723c034cb5676d0e6537d6f2edab9a4d0234493436f68b5688e91e436f269488		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F7 7848 bytes

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