Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01c253be996d31b…

MALICIOUS

PDF

28.7 KB Created: 2020-04-03 11:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 38c95a9890bc4d31089f3e29dc2beee6 SHA-1: fe7f76fe7d7a40395fcf41fbbafc4fb27bfad72c SHA-256: c01c253be996d31bbec1b34a783a7a30d884fd00b4ff1f54a3d67370693cc532
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious nature of the embedded URLs. No scripts were extracted from this sample, but the extensive link farm suggests a delivery mechanism for further malicious activity.

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://easyfreelegal.com/uploads/1/3/1/4/131437632/131437632.html#mcculloch+weed+eater+manual
    • http://wedding-photography-nyc.com/uploads/1/3/0/6/130639148/7435784.pdf
    • http://sij-2.sij.net/uploads/1/3/0/4/130488195/46c3269e.pdf
    • http://madder.store/uploads/1/3/0/8/130813859/8183716.pdf
    • http://jennifersblingtastic.com/uploads/1/3/0/7/130739076/4615209.pdf
    • http://auburnincubator.com/uploads/1/3/0/8/130873769/sapoga.pdf
    • http://vibesouthwest.com/uploads/1/3/0/6/130639385/d75cc13c9fa.pdf
    • http://allaboutmomanddad.com/uploads/1/3/0/8/130874231/3121477.pdf
    • http://yessicacurielmontoya.com/uploads/1/3/0/7/130738639/be8bc4f.pdf
    • http://doricwoodworking.com/uploads/1/3/0/6/130639510/6679123.pdf
    • http://inmemoryofwalk.com/uploads/1/3/0/6/130605256/wutisadoxoxewe_busorademerigo_samokozej_dudonixe.pdf
    • http://beautesache.ru/uploads/1/3/0/6/130621283/liporubas.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_off00004eb8.bin
e1529baded6610677fc3310edd4c111eaa28d1639f85c666635d3939c99b12d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EB8 5824 bytes

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