Malicious PDF — malware analysis report

Static analysis result for SHA-256 78818ab958ea1d2e…

MALICIOUS

PDF

41.6 KB Created: 2020-04-17 19:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: 5a2ac5c596774ff2b92d7e96c433927a SHA-1: bdfd18ae9233dac6e18edf6834b1e613d7c50f2c SHA-256: 78818ab958ea1d2e9bbe9ee2ea6ad2be9fdef068c150976c39b601bd84d46673
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named PDFs hosted on various domains, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains a URL that matches one of the extracted links, indicating an attempt to redirect the user. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://scentsationsbvi.com/uploads/1/3/0/6/130621552/130621552.html#fall+risk+assessment+form+pdf PDF link annotation
    • http://sisulife.shop/uploads/1/3/0/8/130874127/fotevogozomov_medoretujem.pdfIn PDF document text
    • http://amuseboucheentertainment.com/uploads/1/3/0/6/130605124/diwotonito.pdfIn PDF document text
    • http://assurancecapital.org/uploads/1/3/0/2/130289367/3946703.pdfIn PDF document text
    • http://slabtownhound.com/uploads/1/3/0/8/130874307/dazidu-rozelunetu-vanuritok-vexuv.pdfIn PDF document text
    • http://coricutit.com/uploads/1/3/0/3/130313564/sowokinijofef.pdfIn PDF document text
    • http://mainelypallets.com/uploads/1/3/1/4/131483249/bifezogad.pdfIn PDF document text
    • http://autismmomspeak.com/uploads/1/3/0/5/130588721/gezizavosekilakisox.pdfIn PDF document text
    • http://lifebalanceyogawellness.com/uploads/1/3/0/6/130604685/6509902.pdfIn PDF document text
    • http://cataproject.com/uploads/1/3/1/1/131164077/bcb56769ce2.pdfIn PDF document text
    • http://xpertonet.com/uploads/1/3/0/6/130604355/2211871.pdfIn PDF document text
    • http://inlakesh.website/uploads/1/3/0/5/130590261/6923357.pdfIn PDF document text
    • http://videoprofesionalcr.com/uploads/1/3/0/6/130604113/200b6ed.pdfIn PDF document text
    • http://sighmoan.net/uploads/1/3/0/7/130775111/falet.pdfIn PDF document text
    • http://austinarias.com/uploads/1/3/0/2/130288455/wekujogadatir.pdfIn PDF document text
    • http://easyorchidgrowing.com/uploads/1/3/1/4/131437883/pivin.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6707 7800 bytes
SHA-256: 49a3b71a2c64ee7bfa8b465aba42c0c7f427accb29586247498d613daaaf7e2f
font_01_sfnt_off00008523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8523 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63

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