Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab8ae44a7298f63…

MALICIOUS

PDF

37.8 KB Created: 2020-04-01 20:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e55d5a3b00bc734a28fe8f90d0f20739 SHA-1: 50f20225b727d82555b9ff8b5f6a2de66f5544f8 SHA-256: cab8ae44a7298f63f1cd0d3f5021f7a43e111aa03adc3e30c0dd31a2bd4ccc3f
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The document body, though corrupted, contains text related to inserting tables in Word and references the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a link farm attack.

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://jessicastameyshairbydesign.com/uploads/1/3/0/6/130604903/130604903.html#como+insertar+tabla+de+ilustraciones+en+word
    • http://rippletheatreproject.com/uploads/1/3/0/2/130289291/jokixa.pdf
    • http://robbinsroostrealestate.com/uploads/1/3/0/3/130379210/jodoziparodiviw.pdf
    • http://nethandilin.fo/uploads/1/3/0/6/130604168/livati-dekotuwat-lefat.pdf
    • http://mnmcamp.com/uploads/1/3/0/8/130813409/zatulu.pdf
    • http://mail.jlorennorris.com/uploads/1/3/0/5/130590043/wipifaledanovev-boviwimeguj-kedagajemigovi-lasediguwiguga.pdf
    • http://managerlog.us/uploads/1/3/0/6/130621509/meguf_riwegomav.pdf
    • http://sernasinsuranceagency.com/uploads/1/3/0/7/130776587/vevipoxawukokodujopa.pdf
    • http://dragonflyhairco.com/uploads/1/3/0/6/130621330/9600901.pdf
    • http://anthemuas.com/uploads/1/3/0/7/130738798/sorifawoza.pdf
    • http://taylortransit.net/uploads/1/3/1/0/131071111/litesomivuseferab.pdf
    • http://www.newearthwarrior.org/uploads/1/3/0/6/130640081/rajidaveta.pdf
    • http://uniformeselpalacio.com/uploads/1/3/0/6/130640010/vasotizokos.pdf
    • http://xileart.com/uploads/1/3/0/4/130476148/3220511.pdf
    • http://nangrayphotography.com/uploads/1/3/0/7/130739164/b9db1873fa23c39.pdf
    • http://organizemychaos32960.com/uploads/1/3/0/3/130379126/8441427.pdf
    • http://mrshawkinsclass.com/uploads/1/3/0/3/130379422/nofujopunerew-jijores-tufarufifawisu-tajezifemo.pdf
    • http://backpackvideos.com/uploads/1/3/0/6/130639634/vogigafoxab-vamedinawusawu-zapilif.pdf
    • http://thezaclane.com/uploads/1/3/0/5/130542983/7537595.pdf
    • http://adamstechsupport.com/uploads/1/3/1/4/131408204/4368378.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_off00006b86.bin
4badf00bc04a932b134c37e4fe5a928e7c8d1c83d8bffbbc73731ef95f463e48
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B86 7572 bytes