Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31545f952b74671…

MALICIOUS

PDF

44.2 KB Created: 2020-03-31 12:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2765745b647ead67f173e94b2792cc53 SHA-1: cc239943515092ba118412e253d225dacc2f57e2 SHA-256: f31545f952b74671648254e85b0c76c91a7c0b0cf893a2cd0b2401c943a60a2f
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains the phrase 'Palabras con pru al final' and references wkhtmltopdf, suggesting it's a generated document. The primary attack pattern involves directing users to a network of suspicious domains, likely for malicious redirection or content delivery. No scripts were extracted from this sample.

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://thesweetmission.com/uploads/1/3/0/3/130313585/130313585.html#palabras+con+pru+al+final
    • http://centralhoustonautofinance.com/uploads/1/3/0/4/130435906/4933805.pdf
    • http://adamcanver.com/uploads/1/3/0/5/130551597/mepixipetuve_xomezozonisuzo_sazutozijunanu_wifovave.pdf
    • http://teambleau.com/uploads/1/3/0/3/130323568/3b6776.pdf
    • http://silangancrossfit.com/uploads/1/3/0/6/130620430/107193.pdf
    • http://rubadubdogwash.com/uploads/1/3/0/8/130873738/ropufejaz.pdf
    • http://rainboascales.com/uploads/1/3/0/2/130287862/6291564.pdf
    • http://adamstutoring.org/uploads/1/3/0/7/130776821/15ada1e58e5467.pdf
    • http://raghuriat.ca/uploads/1/3/0/3/130313155/db274.pdf
    • http://24westdesigns.com/uploads/1/3/0/5/130539131/tekokajupow.pdf
    • http://eternalhopehospiceinc.net/uploads/1/3/0/2/130292089/ffa4410b0.pdf
    • http://wavemanwealth.com/uploads/1/3/0/7/130775370/795572.pdf
    • http://soapytoad.com/uploads/1/3/0/6/130621284/48598913dd57.pdf
    • http://thetreedetectives.com/uploads/1/3/0/6/130604563/vezafimajexupu.pdf
    • http://rewireyourhealth.com/uploads/1/3/0/4/130436204/1f46fc5ebd51e7.pdf
    • http://soulbodyhealth.net/uploads/1/3/1/1/131163712/vutadarexaw-vupedinim-kavawakapizi-nogut.pdf
    • http://codyjelms.com/uploads/1/3/0/4/130476804/tevijajixopuped-dubumetifag-wimezamoguv-kijonone.pdf
    • http://sweetiecat.com/uploads/1/3/0/6/130604263/7822636.pdf
    • http://aidincrisis.com/uploads/1/3/0/6/130639616/23650432ad5e969.pdf
    • http://maxxdbxx.com/uploads/1/3/1/0/131070859/5700130.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007376.bin
79152cfc604264b0f0e00ea67ee0d96961c0d02104abc93cd828d09c0a657a42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7376 9292 bytes
font_01_sfnt_off0000949a.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x949A 4144 bytes

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