Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b2f7f57a66e2ee…

MALICIOUS

PDF

49.4 KB Created: 2020-03-20 08:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a8aa14d4f16ac081721abdf4fc5689b7 SHA-1: c47a94837d8ff0a3674ec756547eb4b0c12c263e SHA-256: 67b2f7f57a66e2eeceedb39eceb2d71918405091e6970c2d6dfe22bf49fef995
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to similarly structured URLs, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to potentially harmful content or facilitate further compromise. No scripts were extracted, but the PDF structure and numerous external links are indicative of a dropper or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-9241392-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9241392-0
  • 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://realnursingrn.com/uploads/1/3/0/5/130589391/130589391.html#que+es+un+incentivo+salarial
    • http://harrisonashtonphoto.com/uploads/1/3/0/3/130312916/nofovegiwujumozub.pdf
    • http://www.igtbookkeeping.com/uploads/1/3/0/9/130969308/aacfdf56.pdf
    • http://www.alaskakidsnightclinic.com/uploads/1/3/0/2/130289428/konule.pdf
    • http://skatewithlaura.com/uploads/1/3/0/5/130588803/8b448d.pdf
    • http://tackletote.com/uploads/1/3/0/6/130620343/9971946.pdf
    • http://youngmenofrespect.org/uploads/1/3/0/6/130604940/legurejifuja-jejit-kusigefexet.pdf
    • http://liunalocal607.com/uploads/1/3/0/2/130274267/4122978.pdf
    • http://mta-sts.mx.skipstonepublishing.com/uploads/1/3/0/5/130545434/3920611.pdf
    • http://melmadotcom.com/uploads/1/3/0/7/130738979/vuzuzat.pdf
    • http://hostmaster.akapartyband.co.uk/uploads/1/3/0/7/130738892/1169797.pdf
    • http://www.alamojump.shop/uploads/1/3/0/5/130588867/puvenadepu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077b2.bin
86be2aa3720196be0a54e452f9f82fcb3a2f7c4eeeb5b3684ba0ab48d178bddb
pdf-font-stream PDF embedded font (sfnt) at offset 0x77B2 8904 bytes
font_01_sfnt_off00009827.bin
b3b238fd3ac8794d753ddbfa4f07e4c45303c142b604be13bf8677e74c85e3cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x9827 1960 bytes
font_02_sfnt_off0000a0b7.bin
1d1fa5121415f8f5353993473374918b9d2a38f433752094af4cce5d3be72c8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xA0B7 16312 bytes