Malicious PDF — malware analysis report

Static analysis result for SHA-256 771ac93800efa244…

MALICIOUS

PDF

45.2 KB Created: 2020-04-08 12:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f9894dbdae9a1e245ce776b8906ab5ac SHA-1: 2e232688e97d6974fb01121352c367a4fbea6072 SHA-256: 771ac93800efa2443181193e9f2f757d6d007533924ac52f790591493d4205da
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary purpose appears to be directing users to a network of websites, potentially for SEO manipulation or to serve as a distribution point for further malicious content. No scripts were extracted from this sample, limiting the analysis of direct execution capabilities.

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://jaymebucheltart.com/uploads/1/3/1/3/131383493/131383493.html#formula+costo+anual+equivalente+excel
    • http://mlpropertymaintenance.net/uploads/1/3/1/4/131437243/1369162.pdf
    • http://thewanderingtourist.com/uploads/1/3/0/7/130776872/bb582da0ab7.pdf
    • http://jacobsladderdeli.com/uploads/1/3/0/7/130739459/zefal.pdf
    • http://growlerlake.com/uploads/1/3/0/7/130740458/janamejovovevibidaj.pdf
    • http://ahajog.com/uploads/1/3/0/3/130379078/3910839.pdf
    • http://brickandstonerepair.com/uploads/1/3/0/6/130620176/wakipazimobiz.pdf
    • http://jaynecrews.com/uploads/1/3/0/5/130589128/rozurosagufem.pdf
    • http://zafferanomonferrato.net/uploads/1/3/0/6/130621732/ca07f6e.pdf
    • http://riseupdevotions.com/uploads/1/3/0/7/130739250/poket.pdf
    • http://sparkmechanical.com/uploads/1/3/0/6/130639143/lorul-dozajope-kugazifoz-luxamo.pdf
    • http://lawpixel.com/uploads/1/3/0/5/130542985/1746793.pdf
    • http://peristeri-guide.com/uploads/1/3/0/8/130814763/4271729.pdf
    • http://theonestopblog.com/uploads/1/3/0/4/130476786/3863757.pdf
    • http://marioborobudur.com/uploads/1/3/0/5/130590458/3923157.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f60.bin
4f188e6c53513d5a7b50d9179df062ed439ec3d3d08caf56772d255b3beaa414		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F60 9144 bytes
font_01_sfnt_off0000908a.bin
613ee93c29569eb00b93764606f1fa5fed750c78578cd984b258cb10d738d673		 pdf-font-stream PDF embedded font (sfnt) at offset 0x908A 16076 bytes

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