Malicious PDF — malware analysis report

Static analysis result for SHA-256 12037c041e211956…

MALICIOUS

PDF

46.2 KB Created: 2020-04-11 07:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9a89e09f31d6a445e83d0a9b5af46e92 SHA-1: df21cee248508a786badcf18d55088d65bc4a64c SHA-256: 12037c041e211956a115e55eae96a75585cb620cbca612f06a9437957fcba44c
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, identified as a link farm, pointing to various domains. The primary URL http://wcd-3ni9vm8.mgh-r.ch/uploads/1/3/0/7/130739893/130739893.html#funny+bone+real+name suggests a lure or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious intent, potentially for SEO abuse or hosting 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://wcd-3ni9vm8.mgh-r.ch/uploads/1/3/0/7/130739893/130739893.html#funny+bone+real+name
    • http://chrisehammond.com/uploads/1/3/0/8/130874370/8027803.pdf
    • http://vitaltrainers.com/uploads/1/3/0/6/130639837/9600300.pdf
    • http://boostswimming.net/uploads/1/3/1/4/131408502/zavemuv.pdf
    • http://blackwellsonline.com/uploads/1/3/1/3/131384229/9159385.pdf
    • http://stjeromewestchester.org/uploads/1/3/1/1/131164032/5097914.pdf
    • http://puffymediagroup.com/uploads/1/3/0/6/130604424/rogotezedafamizav.pdf
    • http://memoirsofatechnocrat.com/uploads/1/3/0/8/130813504/tugavumutubir.pdf
    • http://rhymingchemist.com/uploads/1/3/0/7/130776122/4464ee1c554a9.pdf
    • http://rds-aviation-of-the-world.net/uploads/1/3/0/5/130589179/ranepelijaz_wisaw_gokivujokug.pdf
    • http://www.commons-middletown.com/uploads/1/3/0/2/130287536/4852cd94cd.pdf
    • http://straightupfarm.com/uploads/1/3/0/6/130640060/munilulo.pdf
    • http://generationepac.org/uploads/1/3/0/2/130288419/kapolipuwelu.pdf
    • http://dilione.com/uploads/1/3/1/3/131398526/jubikitajo_fudig.pdf
    • http://sunflowerjewelsshop.com/uploads/1/3/0/6/130621209/lujopinosu.pdf
    • http://bytownvapes.com/uploads/1/3/0/2/130270951/341164665.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/
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f9a.bin
526eda01972e210be4a9a3d7f00be78451ef0de2b5179071cee2789591d43b35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F9A 8160 bytes
font_01_sfnt_off00009f4d.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F4D 4144 bytes

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