Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfa9b3ea01dfa37…

MALICIOUS

PDF

38.0 KB Created: 2020-03-23 07:47:17 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1e3f2f3d6476b6c15f02a11692782555 SHA-1: c0cf2fc61891052735a88c5c6ae9147c8a451fd0 SHA-256: bcfa9b3ea01dfa3750a99acaaf6bea5c0498b76a5b238ac099080fa560fc5861
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to 'Vocabulary workshop' and lists numerous URLs pointing to PDF files on various domains. This suggests a link farm or content distribution scheme, likely intended to manipulate search engine results or serve as a lure for malicious content. The ML classifier strongly supports the malicious verdict.

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://dylanwyke.com/uploads/1/3/0/6/130621214/130621214.html#vocabulary+workshop+level+b+answer+key+unit+3
    • http://grupowf.net/uploads/1/3/0/6/130620380/cf449a3342c39c3.pdf
    • http://langfordglass.com/uploads/1/3/0/8/130814960/zupuwejemebasagezif.pdf
    • http://mail.wheelsorheels.com/uploads/1/3/0/3/130379285/wapuvuw-pisolagez-xururufa.pdf
    • http://michaelandamandawedding.com/uploads/1/3/0/3/130324451/vupowuvapimefer.pdf
    • http://1kontakt.info/uploads/1/3/0/8/130814861/9218737.pdf
    • http://obrienclan.com/uploads/1/3/0/7/130738943/kiwapabiw.pdf
    • http://jolie69.club/uploads/1/3/0/3/130379743/wulufavetivin_lorifalidu_xijuwifo_fevimowiwe.pdf
    • http://mobyzap.com/uploads/1/3/0/6/130605166/fitejo.pdf
    • http://www.supermombc.com/uploads/1/3/0/6/130639822/givilalozanoseji.pdf
    • http://www.accessmicropower.com/uploads/1/3/0/3/130313445/girupi_mupebafenokef.pdf
    • http://hostmaster.18u.org.uk/uploads/1/3/0/5/130544243/josixirupamosupafe.pdf
    • http://www.foundationforburnrehab.org/uploads/1/3/0/5/130551618/gabezolexukovamavoza.pdf
    • http://undernolaws.com/uploads/1/3/0/7/130739922/jexigiraxegelenawumi.pdf
    • http://thesugarlifeco.net/uploads/1/3/0/7/130775337/tevonirolob-vufogijuk.pdf
    • http://www.runwildwa.com/uploads/1/3/0/6/130605389/6406518.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_off000070f8.bin
708cf886b89dd6952c5b6e1327b7ef677a08149cd422360a92d76402f300d7f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F8 6352 bytes

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