Malicious PDF — malware analysis report

Static analysis result for SHA-256 823f330f1e996e91…

MALICIOUS

PDF

37.3 KB Created: 2020-03-22 03:38:42 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6c557dc40f54044727292232a24e6ef1 SHA-1: f2bcd239fe74cce5ecb0c964b348af575fdfd94b SHA-256: 823f330f1e996e9172a72acbf8056604056c2eee49b6dd4f9f9491f2b0de1887
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which are structured as numeric slugs and point to various domains. This behavior is indicative of a link farm or SEO manipulation tactic, often used to distribute malicious content or phishing pages. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is not benign. No scripts were extracted, but the sheer volume of external links suggests an attempt to redirect the user to potentially harmful 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://sweetestdreams.org/uploads/1/3/0/4/130435570/130435570.html#ego+t+vape+pen+for+sale+near+me
    • http://nataliemooremakeupartist.com/uploads/1/3/0/2/130272640/5332962.pdf
    • http://www.plussizebridalsvt.com/uploads/1/3/0/9/130968958/fojijumop-vagifuluxapol-zavifejavajuj.pdf
    • http://hostmaster.athletetrainingsystems.co.uk/uploads/1/3/0/6/130604716/xulenumepojumig.pdf
    • http://jesus4real.org/uploads/1/3/0/5/130551091/sizamomel.pdf
    • http://cuppagusto.com/uploads/1/3/0/6/130640071/fuwugodatul.pdf
    • http://ninaceledonio.com/uploads/1/3/0/6/130605349/buzizipubufo.pdf
    • http://mysyracuse.com/uploads/1/3/0/7/130776322/599614.pdf
    • http://www.nartinconstruction.com/uploads/1/3/0/3/130379365/3080750.pdf
    • http://www.tamaolver.com/uploads/1/3/0/8/130874583/daliwesinunig.pdf
    • http://charlesheiner.net/uploads/1/3/0/8/130874278/zezumimilerid.pdf
    • http://americanlifeguards.com/uploads/1/3/0/5/130590265/2408414.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_off0000676d.bin
d87537d78ab712982627304c7519fe517dd4d84aa038c123eb240d426c6d77d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x676D 8672 bytes

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